Knob assembly for cook top

ABSTRACT

A knob assembly includes a front panel, a knob located at a front side of the front panel and configured to rotate based on operation by a user, a knob shaft that is coupled to the knob and that extends through the front panel, a supporting pipe that receives the knob shaft and that supports the knob shaft, the supporting pipe being configured to maintain a position relative to the front panel, a valve configured to control supply of gas to the appliance, a valve shaft connected to the valve and configured to control the valve to adjust a flow rate of gas based on rotation of the valve shaft, and a joint that couples the knob shaft to the valve shaft and that is configured to transfer at least one of a rotational motion or a linear motion of the knob shaft to the valve shaft.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. application Ser. No.16/923,828, filed on Jul. 8, 2020, which is a continuation of U.S.application Ser. No. 15/900,442, filed on Feb. 20, 2018, now U.S. Pat.No. 10,746,409, which claims priority to and the benefit of KoreanPatent Application No. 10-2017-0023733, filed on Feb. 22, 2017, andKorean Patent Application No. 10-2017-0167074, filed on Dec. 6, 2017,the disclosures of which are incorporated herein by reference in theirentirety.

FIELD

The present disclosure relates to a knob assembly for adjusting a timerand a firepower level of a cooking appliance, and a cooking applianceincluding the same.

BACKGROUND

A cooking appliance can be classified variously, for example, accordingto the kind of fuel, a heat source, a form, etc., and may be one of homeappliances for cooking food.

For example, the cooking appliance may be classified into an open typeand a closed type depending on the form of a space where food is placed.

A closed type cooking appliance is a cooking appliance that closes thespace where food is placed and cooks food by heating a closed space. Forexample, an oven, a microwave oven, etc. may belong to the closed typecooking appliance.

An open type cooking appliance is a cooking appliance that cooks food byheating a food item or a food container in an open space. For example, acooktop, a hob, etc. may belong to the open the cooking appliance.

In some examples, the closed type cooking appliance and the open typecooking appliance may be installed in a single product, and a compositecooking appliance is proposed in which a plurality of heat sources arecombined to cook various types of food or a plurality of items of food.

For example, in the composite cooking appliance, the open type cookingappliance may be arranged on the upper side of the closed type cookingappliance. The open cooking appliance may include a plurality of heatersor burners to enable cooking of a plurality items of food at the sametime.

One example of the open type cooking appliance is a gas range that usesgas as a fuel. A gas range is a device that cooks food using a flamegenerated by burning gas.

There are various ways for a user to control an intensity of the flameof the cooking appliance. For example, a method of controlling firepowerby adjusting the amount of rotation of a knob by using the knob rotatingaround a predetermined adjustment shaft are mostly used.

In some examples, the cooking appliance using gas may include astructure in which the amount of opening and closing of the valve ofsupplying gas is controlled according to the amount of rotation of theknob. In some cases, for safety, a gas valve may rotate with the knobonly when the knob is pressed and rotated.

In some examples, the closed type cooking appliance may be used for along time cooking, and may include a timer for setting a cooking time.In other examples, the open type cooking appliance may include a timerhaving a cooking time alarm function in order to improve a userconvenience.

SUMMARY

The present disclosure may provide a fire power controlling knobassembly capable of setting a timer by using a knob ring arranged arounda knob for controlling the fire power and displaying information, and acooking appliance including the same.

The present disclosure may mitigate a misalignment of the knob due to anaccumulation of an assembly tolerance. A misalignment may cause adegrade of an appearance quality due to a position error of the knob, oroperation failure, for example, for fitting the knob.

The present disclosure may provide a support structure in which the knobconnected to a valve assembly can be stably supported, thereby improvinga reliability of a knob operation.

The present disclosure may provide a structure that can stably couple adisplay device to a knob ring in which the display device can beproperly insulated.

The present disclosure may provide a structure that restricts rotationof the knob in a state where the knob is not pushed, in a knockoperation structure in a push and turn manner.

The present disclosure may enable a fine adjustment of a flow rate ofthe valve assembly according to an installation environment, and tofacilitate the fine adjustment of the flow rate without separating thecooking appliance.

The present disclosure may provide a knob assembly in which a joint isarranged between a knob and a valve assembly so that assembly tolerance,etc. generated in the valve assembly may not be transferred to the knob.

The present disclosure may provide a knob assembly for allowing thejoint to absorb a position error of a valve shaft so that the knob canbe assembled at a predetermined position with regard to a front panel ata predetermined amount of protrusion.

The present disclosure may provide a knob assembly that is rotatableabout a knob ring arranged in the periphery of the knob, wherein theknob ring can stably rotate and always return to a predeterminedposition by an elastic force.

The present disclosure may provide a knob assembly that allows the knobring to be fixed constant in its initial position.

The present disclosure may provide a knob assembly having a sensorcapable of sensing the amount of rotation of a valve shaft and capableof display the size of the fire power on the display device provided onthe knob ring by using the sensed amount of rotation of the valve shaft.

The present disclosure may provide a knob assembly that uses a Hallsensor and a magnet as a sensor for sensing the amount of rotation ofthe valve shaft, and can maintain a constant spacing between the Hallsensor and the magnet even when an operation of the knob is repeated.

The knob assembly according to the present disclosure can be fixed in astate in which the knob handle is aligned in the front panel, therebyimproving the appearance quality of the cooking appliance.

In addition, the knob assembly according to the present disclosureabsorbs the position error of the valve shaft of the valve assembly inthe joint, and a knob shaft coupled to the knob handle can be stablysupported on the knob ring, which may mitigate a fitting problemgenerated during operation of the knob handle.

The knob assembly according to the present disclosure may include a knobring which can be independently operated at a circumference of the knobhandle so that the timer time of the cooker such as the correspondingburner or the oven can be set through the operation of the knob ring.

In some implementations, the display device is provided in the knobring, and the fire power or the timer time, etc. of the correspondingcooker can be displayed on the display device, thereby resulting in aneffect of improving convenience for a user. For example, the displaydevice may have the structure which is coupled to a knob ring body in astate surrounded by a side to the display housing, which is aninsulating material, resulting in an effect of securing insulationperformance of the display device even when the knob ring body is formedof a metal material.

In some implementations, the knob assembly according to the presentdisclosure can be stably operated in a state which the position of theknob ring is fixed with regard to the front panel, and by providing astructure in which the knob shaft of the knob is supported to the knobring, resulting in an effect which can be aligned at a predeterminedposition with regard to the front panel of the knob handle and the knobring.

According to the present disclosure, it may be possible to stablyprovide a measurement result of the knob rotation amount with highaccuracy without a noise, and to provide an effect of stably perform anoperation control for outputting a rotation state of the knob handle, orthe control with regard to the operation performed through the rotationof the knob handle.

In some implementations, the present disclosure not only contributes toa significant reduction in the risk of generating fire due to gasleakage but also secures information on the failure of components forsecuring the rotation of the knob handle quickly and accurately. It maybe possible to provide a highly reliable sensing result since an errordue to a noise or an error of an electronic component may be prevented.

In some implementations, by providing an independent operation switchhaving a function and a shape different from those of an existing knobring by using a knob ring installed for finishing the knob handle, sothat the user can easily select an operation switch suitable for theuse, thereby providing improved use convenience, and, by reducing thenumber of the operation switch arranged on the front surface of thecooking appliance, thereby improving a sense of beauty of the frontsurface of the device.

In some implementations, the present disclosure may provide a functionin which a physical power transmission operation through a knob handleoperation and a sensing operation for sensing an operation of the knobhandle are simultaneously performed, while suppressing an increase ofparts, an assembly process, and a manufacturing cost required forimplementing this function. The manufacturing operation may be performedmore easily. The present disclosure may effectively improve sensingperformance of the operation of the operation switch such as the knobhandle and the knob ring.

In some implementations, when two shafts are connected to both ends ofthe joint, respectively, a connection angle between the first shaftsupporting portion and the second shaft connecting portion may be set toa state suitable for connecting the two shafts, and this state can bemaintained or changed in accordance with the situation by the elasticforce of the elastic member.

Therefore, the present disclosure may provide an effect of capable ofeffectively absorbing the position error between two shafts without aseparate operation for controlling the connecting angle of the firstshaft supporting portion and the second shaft supporting portion, andseparate operation for fixing an adjusted connecting angle of the firstshaft supporting portion and the second shaft supporting portion, andaccordingly, effectively connecting two parts which are difficult to beconnected to the same axis.

In some implementations, an installation process is possible without theadditional operation for adjusting the connection angle, by making thejoint be assembled with only a small number of parts, the partmanagement and an assembly operation can be easily made and the cost andtime required for the manufacturing of the joint can be reduced.

In some implementations, the present disclosure can prevent a returnposition deviation of the knob ring provided by the independentoperation switch from being generated, thereby effectively preventing anappearance defect of the cooking appliance due to the return defect ofthe knob ring from being generated.

In some implementations, since a rotation operation of knob ring ispossible by applying force beyond a predetermined degree, an operatingmistake of the knob ring may be prevented, and the operation feeling foreasily recognizing the start of rotation of the knob ring can beprovided to the user.

In some implementations, the present disclosure also provides a valvepushing force compensating structure which absorbs an influence due toperformance deviation of the valve pressing force so that the valve canbe opened only by a pushing force of beyond predetermined level, andthus, it may be possible to reduce a risk generating safety accidentssuch as fire due to a potential opening of the valve that is not made byan intended operation of the user.

According to one aspect of the subject matter described in thisapplication, a knob assembly includes a front panel that defines anappearance of an appliance, a knob located at a front side of the frontpanel and configured to rotate based on operation by a user, a knobshaft that is coupled to the knob and that extends through the frontpanel, a supporting pipe that receives the knob shaft and that supportsthe knob shaft, the supporting pipe being configured to maintain aposition relative to the front panel, a valve located in the applianceand configured to control supply of gas to the appliance, a valve shaftconnected to the valve and configured to control the valve to adjust aflow rate of gas based on rotation of the valve shaft, and a joint thatcouples the knob shaft to the valve shaft and that is configured totransfer at least one of a rotational motion or a linear motion of theknob shaft to the valve shaft.

Implementations according to this aspect may include one or more of thefollowing features. For example, the supporting pipe may include anouter supporting pipe that extends forward of the front panel along aline, and an inner supporting pipe that extends rearward of the frontpanel along the line. The knob shaft is configured to pass through theouter supporting pipe and the inner supporting pipe. The knob assemblymay further include a knob ring located between the front panel and theknob and configured to receive the knob shaft in which the supportingpipe extends from the knob ring. The knob ring may be configured torotate independently of rotation of the knob based on operation by auser, and the knob ring may include a handle that protrudes forward ofthe knob and that is configured to receive input from the user.

In some implementations, the joint may include a first shaft couplingportion configured to couple to the valve shaft, a second shaft couplingportion configured to couple to the knob shaft, a joint spring that islocated between the first shaft coupling portion and the second shaftcoupling portion, and that allows the knob shaft to couple to the valveshaft regardless of deviation of at least one of the knob shaft or thevalve shaft from a coaxial direction, and a joint housing thataccommodates the first shaft coupling portion, the second shaft couplingportion, and the joint spring, and that is configured to transfer arotational motion of the first shaft coupling portion to the secondshaft coupling portion.

In some examples, the valve may include a valve body that defines a gasflow path, a main adjustment part that is located inside of the valvebody, and that is configured to, based on the main adjustment part beingrotated by the valve shaft, control a flow rate of gas in the gas flowpath, an auxiliary adjustment part that is located at a side of the mainadjustment part in of the valve body, and that is configured to, basedon the auxiliary adjustment part being rotated by a separate tool,control the flow rate of gas in the gas flow path, and a valve cap thatis coupled to a front side of the valve body and that covers the frontside of the valve body. The front panel may define a service hole thatis located at a position corresponding to a projection of the auxiliaryadjustment part to the front panel, and that allows access to theauxiliary adjustment part in a state in which the knob is separated fromthe front panel.

In some implementations, the knob assembly may further include a knobsensor configured to sense rotation of the valve shaft, and the valvecap includes a sensor fixing portion coupled to the knob sensor. Theknob sensor may include a sensor plate configured to couple to thesensor fixing portion, a knob sensor housing configured to maintain aposture relative to the sensor plate, a sensor board configured tocouple to the knob sensor housing, a plurality of Hall sensors that areradially arranged on the sensor board and that defines a sensing range,a rotating plate configured to couple to the valve shaft and rotatebased on rotation of the valve shaft, and a knob sensor magnet locatedat the rotating plate and configured to pass the sensing range of theplurality of Hall sensors based on rotation of the valve shaft. Thevalve shaft may be configured to penetrate the sensor plate, the knobsensor housing, and the sensor board.

In some implementations, the knob assembly may further include a sensorspring that is located between the sensor plate and the knob sensorhousing, and that is configured to provide elastic force to the knobsensor housing toward the rotating plate. In some examples, the knobassembly may further include a fixed pipe configured to couple to a rearside of the front panel and to support the knob shaft between thesupporting pipe and the joint. The knob assembly may further include asupport frame that is configured to receive the supporting pipe, that isconfigured to couple to the rear side of the front panel, and thatdefines a support frame through hole; and a fixed frame that isconfigured to couple to the support frame and that extends across thesupport frame through hole in which the fixed pipe is configured tocouple to the fixed frame. In some examples, the fixed pipe may includea second tube part configured to rotatably couple to a front end of thejoint.

In some implementations, the knob assembly may further include a lockingbracket including a locking piece that is configured to couple to thefront side of the front panel, that protrudes to an inside of the knob,and that defines a passage groove at a rear side of the locking piece.The knob may include a guide surface that has a ring shape and that isconfigured to interfere with the locking piece in which the guidesurface defines a cutting section configured to receive the lockingpiece in an initial position. The guide surface is further configured to(i) based on the knob being in the initial position, interfere with thelocking piece to restrict rotation of the knob, and (ii) based on theknob being pushed from the initial position, define a plane coplanarwith the passage groove to allow rotation of the knob.

In some examples, the knob may include a knob body that defines anappearance of the knob, and a knob back plate that is coupled to aninside of the knob body, and the guide surface is located at the knobback plate.

According to another aspect, an appliance including a burner may includea valve configured to control a flow rate of gas that flows to theburner, and a knob assembly configured to operate the valve. The knobassembly may include a front panel that defines a surface of theappliance, a knob located at a front side of the front panel andconfigured to rotate based on operation by a user, a knob shaft that iscoupled to the knob and that extends from the knob through the frontpanel, a supporting pipe that receives the knob shaft and that supportsthe knob shaft, the supporting pipe being configured to maintain aposition relative to the front panel, a valve shaft connected to thevalve and configured to control flow of gas in the valve, and a jointthat is configured to couple the knob shaft to the valve shaft and totransfer at least one of a rotational motion or a linear motion of theknob shaft to the valve shaft.

Implementations according to this aspect may include one or more of thefollowing features. For example, the joint may include a first shaftcoupling portion configured to couple to the valve shaft, and a secondshaft coupling portion configured to couple to the knob shaft, and thejoint is configured to, regardless of deviation of at least one of theknob shaft or the valve shaft from a coaxial direction, transfer atleast one of a rotational motion or a linear motion of the second shaftcoupling portion to the first shaft coupling portion. The knob assemblymay further include a knob ring located between the front panel and theknob and configured to receive the knob shaft, and the supporting pipemay include an outer supporting pipe that extends forward from the knobring, and an inner supporting pipe that extends rearward from the knobring.

In some implementations, the knob ring may be configured to rotateindependently of rotation of the knob based on operation by a user, andthe knob ring may include a handle that protrudes forward of the knoband that is configured to receive input from the user. The joint furthermay include a joint spring that is located between the first shaftcoupling portion and the second shaft coupling portion, and that allowsthe knob shaft to couple to the valve shaft regardless of deviation ofat least one of the knob shaft or the valve shaft from the coaxialdirection, and a joint housing that accommodates the first shaftcoupling portion, the second shaft coupling portion, and the jointspring, and that is configured to transfer the rotational motion of thefirst shaft coupling portion to the second shaft coupling portion.

In some examples, the valve may include a valve body that defines a gasflow path, a main adjustment part that is located inside of the valvebody and that is configured to, based on the valve shaft rotating themain adjustment part, control a flow rate of gas in the gas flow path,an auxiliary adjustment part that is located inside of the valve body ata side of the main adjustment part, and that is configured to, based onthe auxiliary adjustment part being rotated by a separate tool, controlthe flow rate of gas in the gas flow path, and a valve cap that iscoupled to a front side of the valve body and that covers the front sideof the valve body. The front panel may define a service hole that islocated at a position corresponding to a projection of the auxiliaryadjustment part to the front panel, and that allows access to theauxiliary adjustment part in a state in which the knob is separated fromthe front panel.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a view showing an example of a composite cooking appliancehaving a timer function.

FIG. 2 is a view showing an example of a position error of an exampleknob.

FIG. 3 is a perspective view illustrating an example fire powercontrolling knob assembly disposed in an example case.

FIG. 4 is a perspective view showing the knob assembly without a frontpanel in FIG. 3

FIG. 5 is a perspective view showing the fire power controlling knobassembly separated into three portions.

FIG. 6 is a perspective view showing the knob assembly of FIG. 4 viewedfrom a rear surface.

FIG. 7 is a side view of the knob assembly of FIG. 4 .

FIG. 8 is a perspective view showing an example knob arranged at anoutermost portion of an example case assembly.

FIG. 9 is a perspective view showing an example rear surface of the knobshown in FIG. 8 .

FIG. 10 is a perspective view showing the knob of FIG. 8 .

FIG. 11 is an exploded view showing the case assembly.

FIG. 12 is an exploded view showing an example inside of the caseassembly.

FIG. 13 is a view showing an example arrangement inside of the frontpanel of the case assembly.

FIG. 14 is an exploded view showing example components arranged outsideof the front panel of the case assembly.

FIG. 15 is a view showing an example state arranged outside of the frontpanel of the case cooking assembly.

FIG. 16 is a perspective view showing an example appearance of the knobring in an assembled state.

FIGS. 17 and 18 are the exploded perspective views showing exampleassembly structures of the knob ring.

FIG. 19 is a perspective view of an example display device of an exampleknob assembly.

FIG. 20 is a perspective view showing a rear surface of an exampledisplay device.

FIG. 21 is a perspective view showing an example display housing.

FIG. 22 is a perspective view showing a rear surface of the displayhousing.

FIG. 23 is a perspective view showing a rear surface of an example knobring of an example knob assembly.

FIGS. 24 and 25 are the views showing example coupling structures, anexample display device, and an example knob assembly.

FIG. 26 is a perspective view showing an example knob ring back plate.

FIG. 27 is a perspective view showing a rear surface of the knob ringback plate.

FIG. 28 is a longitudinal sectional view showing an example knob ring.

FIG. 29 is a view showing an assembly of an example display cover.

FIG. 30 is a perspective view illustrating an example display cover.

FIG. 31 is a half sectional view showing an example display cover.

FIG. 32 is a sectional view showing an example state before the displaycover of the knob assembly is coupled.

FIG. 33 is a cross-sectional view showing an example state in which anexample display cover is coupled to the knob assembly.

FIG. 34 is a cross-sectional view showing an example joint separatedfrom the knob assembly.

FIG. 35 is a perspective view showing an example joint of the knobassembly.

FIG. 36 is an exploded perspective view illustrating an example joint.

FIG. 37 is a longitudinal sectional view showing an example joint.

FIG. 38 is a transverse cross-sectional view showing an example joint.

FIG. 39 is a cross-sectional view showing an example joint portion.

FIGS. 40 and 41 are the views illustrating rotating operation of thejoint.

FIG. 42 is a perspective view of an example valve assembly.

FIG. 43 is an exploded perspective view showing the valve assembly.

FIG. 44 is a perspective view showing an example valve.

FIG. 45 is an exploded perspective view showing an example valve.

FIG. 46 is a longitudinal sectional view showing an example valve.

FIG. 47 is a transverse cross-sectional view showing an example valve.

FIG. 48 is an exploded perspective view showing an example knob sensor.

FIG. 49 is a perspective view showing an example knob sensor board.

FIGS. 50 and 51 are the sectional views showing example operations ofthe valve assembly.

FIG. 52 is a longitudinal sectional view showing an example operationand supporting structure of the knob assembly.

FIG. 53 is a rear view showing the example knob ring.

FIG. 54 is a transverse cross-sectional view showing an example couplingstate of knob ring of the knob assembly.

FIGS. 55 and 56 are views showing example operations of the knob ring.

FIG. 57 is a perspective view showing an example state in which the knobof the knob assembly is separated.

FIG. 58 is a transverse cross-sectional view showing an example state inwhich an example knob is separated from the knob assembly.

DETAILED DESCRIPTION

Hereinafter, the implementations of a fire power controlling knobassembly and a cooking appliance including the same according to thepresent disclosure will be described in detail with reference to theaccompanying drawings. For convenience of explanation, the thicknessesof the lines and the size of the component shown in the drawings may beshown with exaggerated for clarity and convenience of explanation. Inaddition, the terms described below are the terms defined inconsideration of a function of the present disclosure, which may varydepending on an intention or custom of the user and the operator.Therefore, the definition of these terms should be based on the contentsthroughout this specification.

FIG. 1 is a view showing an example of a composite cooking appliancehaving a general timer function.

The illustrated cooking appliance is a composite cooking appliance 1including an oven and a cooktop.

The composite cooking appliance 1 may include a fire power controllingknob 2 for controlling the fire power of the cooking appliance on thefront upper portion, a timer knob 3 for setting the timer time, adisplay device 4 for displaying various states of the cooking appliance,and a switch 5 for separate operation.

In the case of the cooking appliance such as an oven or a grill, sincethere are many cases that a long time operation is required, a timer isalmost necessarily installed.

A fire power controlling knob 2 and the timer knob 3 perform differentfunctions from each other, but have the advantage of being able todisplay a firepower or time through the amount of rotation. For unity ofdesign and convenience of operation, it is general that knobs having thesame outer shape are provided as a form arranged side by side.

In addition, the display device 4 serves to display an operation stateof the cooking appliance, etc. Information displayed on the displaydevice 4 may be an output (or temperature) of a burner, a timer time, acooking of the automatic cooking function, etc.

However, when the number of burner provided with the timer function isincreased, the number of the timer knob 3 has to be also increased, sothat the problem that the front surface shape of the cooking appliance 1becomes complicated is generated. In addition, a concern of confusing asto which timer knob 3 that performs cooking at the same time in variousburners will indicate the cooking time of which burner.

FIG. 2 is a view for explaining a generation of position error of thefire power controlling knob.

As shown, the burner provided in the cooking appliance has a valveassembly 8 for controlling a gas supply amount, and the valve assembly 8is operated by a knob 2 exposed to the front surface of a front panel 10and adjusts the gas supply amount provided to the burner.

The connection between the valve assembly 8 and the knob 2 is made by avalve shaft 9 installed to connect between the valve assembly 8 and theknob 2. When the knob 2 is turned in a state the connection between thevalve assembly 8 and the knob 2 is made, this rotational force istransmitted to the valve assembly 8 through the valve shaft 9, therebyoperating the valve assembly 8.

The opening and closing amount of the valve is controlled by theoperation of the valve assembly 8 made as described above.

The knob 2 and a knob ring 6 that annularly surrounds the periphery ofthe knob 2 are exposed to the appearance of the front panel 10.

The knob 2 is rotatably installed in the left and right direction andthe valve shaft 9 is rotatably coupled in connection with the rotationof the knob 2. The valve shaft 9 having one side in the axial directioncoupled to the knob 2 is rotated in connection with the rotation of theknob 2 and the rotational force transmitted through the valve shaft 9 isa power for the operation of the valve assembly 8.

In some examples, the valve assembly 8 is manufactured by a weldingmethod on a casting. Thus, in the manufacture of the valve assembly 8,the valve shaft 9 has a positional tolerance. This tolerance of thevalve shaft 9 results in a positional deviation of the knob 2 which iseventually assembled to the valve shaft 9. Further, the positionaldeviation of the knob 2 becomes larger as the length of the valve shaft9 becomes longer.

That is, the tolerance of the valve shaft 9 is directly connected by theassembly tolerance of the knob 2 and the knob ring 6 assembled to thevalve shaft 9.

In the figure, the correct assembled positions the knob 2 and the knobring 6 are the positions indicated by dotted lines. However, when thetolerance of the valve shaft 9 is generated as indicated by a solidline, the assembled position of the knob 2 and the knob ring 6 ischanged as indicated by the solid line.

A single cooking appliance may include a plurality of burners. In somecases, the knob 2 and the knob ring 6 connected to the respective valvesneeds to be arranged with a predetermined alignment. In some cases, dueto a tolerance in each of the valve shaft 9, the alignment the knob 2and the knob ring 6 may be externally misaligned, thereby degrading theappearance quality.

In some examples, the tolerance of the valve shaft 9 not only causes asimple appearance defect, but also causes an operation defect. Therotation operation of the knob 2 is not smoothly made due to themisalignment of the valve shaft 9 and it causes the defect which is notreturned since the knob 2 is fitted.

The present disclosure is provided so as to improve the appearancequality of the cooking appliance and reduce the operation defect of theknob 2 by assembling the knob 2 and the knob ring 6 at a correctposition, in order to resolve the above-mentioned problem.

FIG. 3 is a perspective view showing a state in which the fire powercontrolling knob assembly in accordance with an exemplary implementationof the present disclosure is assembled into a front panel, FIG. 4 is aperspective view showing by removing a front panel from FIG. 3 , FIG. 5is a perspective view showing a state which a fire power controllingknob assembly in accordance with an exemplary implementation of thepresent disclosure is separated into 3 portions, FIG. 6 is a perspectiveview of the knob assembly of FIG. 4 viewed from the rear side, and FIG.7 is a side view of the knob assembly of FIG. 4 .

As shown, the fire power controlling knob assembly in accordance with anexemplary implementation of the present disclosure includes a caseassembly 100 assembled to the front panel 10, a valve assembly 300 fixedin the cooking appliance, a joint 200 connecting a knob shaft (116 ofFIG. 8 ) of the case assembly 100 and the valve shaft (330 of FIG. 5 )of the valve assembly 300.

In addition, a knob sensor 400 for sensing a rotation angle of the knobshaft 116 is arranged on the valve assembly 300 and a knob ring sensor500 for sensing the rotation of the knob ring 120 is arranged on thecase assembly 100.

The case assembly 100 includes a knob 110 and a knob ring 120 which areexposed to the outside the front panel 10. Inside of the case assembly100, a support frame 150 is coupled. The support frame 150 is directlyfastened to the front panel 10 and the other components of the caseassembly 100 have the structure coupled to or supported by the supportframe 150.

The knob 110 serves to control an ignition and firepower of the burner.The knob 110 is operated in such a manner that it is rotated while beingpushed. Therefore, the knob 110 has to be movable in the front and reardirection of the front panel 10. Hereinafter, the frontward and rearwardworking distance of the knob 110 is referred to as a front and reardirection stroke.

Since the knob 110 has frontward and rearward stroke, the knob 110 hasto be spaced from the front panel 10 by a spacing corresponding to theforward and rearward strokes in a state of an external force is notapplied. Such spacing of the knob 110 adversely affects the appearancequality.

The original knob ring 120 has begun to be applied for the purpose ofcovering that the knob 110 is separated from the front panel 10. Theknob ring 120 is fixed to the front panel 10 so as to surround theperiphery of the knob 110 not to be exposed for the spacing of knob 110from the front panel 10. Thus, the knob ring 120 had a structure fixedto the front panel 10, unlike the knob 110.

As a result, the knob ring is fixed to the front panel 10, and the knob110 is the structure fixed to the valve shaft inside the cookingappliance. In such a structure, when a position error occurs in thevalve shaft, it had a problem that the knob 110 is not arranged in acentering.

In order to solve such problem, the methods have been attempted tosupport the knob 110 so that it can be arranged at the center of theknob ring 120. However, in this case, when an error occurs in the valveshaft, the knob is excessively rubbed with the knob ring, or the valveshaft is excessively rubbed at the support member, resulting in a resultthat the operation of the knob is not smooth.

In order to solve such a problem, the present disclosure provides thatthe fire power controlling knob assembly is divided into three portions,and the joint 200 is arranged between the case assembly 100 and thevalve assembly 300, so that the joint absorbs the positional error andsecures operation performance of the knob 110.

In addition, according to the present disclosure, the knob ring 120,which had a character of an ornament for improving a conventionalappearance quality, can perform a function as an operation switch fortimer setting. In addition, it is characterized in that a display device125 may be arranged on the knob ring 120 so that the set timer time canbe displayed through the display device 125 arranged on the knob ring120.

At this time, the display device 125 attached to the knob ring 120 maydisplay an intensity of the fire power together with the timer time. Adisplay cover is provided outside the display device 125, but a detailedassembly structure of the display device 125 will be described later. Inthe shown drawings, a reference numeral of the display device isdisplayed at a position corresponding to the position of the displaydevice 125.

The display device 125 is arranged at the upper center of the knob ring120. In addition, the display device 125 is arranged in an inclined formtoward the upper portion so that it can be arranged to keep at a stateclose to right angle from the display device 125 and a view of the user,when the user positioned forward the cooking appliance views the displaydevice 125. It results in an effect of improving a visibility of thedisplay device 125.

This arrangement results in an effect of making it easy to identify thetimer time displayed on the display device 125 during an operation ofthe knob ring 120. The user turns to the left or right of the knob ring120 and set the timer time. In this operation process, it results in aneffect that the display device 125 is not covered by the user's hand.

The valve assembly 300 is assembled to a gas pipe 30 and a gas pipeframe 35, which are fixed inside a cooking appliance body.

In the assembly process of a product, it is made by the method that thefront panel 10 is assembled after manufacturing the cooking appliancebody. When the gas pipe 30 and the gas pipe frame 35 are assembled tothe cooking appliance body, the valve shaft 330 is fixed to the cookingappliance body.

In this state, after assembling the joint 200 to the valve shaft 330 andfinally, the front panel assembled with the case assembly is assembledto the cooking appliance, main body and the knob shaft 116 is fittedinto the joint 200, and the assembly is coupled.

The joint 200 absorbs the position error between the knob shaft 116 andthe valve shaft 330 and serves to transmit a rotation and pushing of theknob shaft 116 to the valve shaft 330. Therefore, since the error of thevalve shaft 330 is not transmitted to the knob 110, it is possible toreduce the position error of the knob 110 and secure operationperformance of the knob 110.

Conventionally, it has the structure that the knob is directly assembledto the valve shaft, so that the position error generated in the valveshaft is transferred directly to the knob, as itself, that is exposed tothe appearance, and it has a problem of degrading the appearance qualityof the cooking appliance.

In some implementations, the knob assembly of the present disclosure isassembled with a state that the knob 110 aligned with regard to thefront panel 10, and the position error of the valve shaft 330 isabsorbed in the joint 200, and thus, the knob 110 does not transfer theposition error of the valve shaft 330 even when the position error isgenerated due to an assembly tolerance in the valve shaft 330 becausethe position error of the valve shaft 330 is absorbed in the joint 200.

This is because the knob 110 is independently assembled at an alignedposition with regard to the front panel 10 and then connected to thevalve shaft 330 inside the cooking appliance by the joint 200.

FIG. 8 is a perspective view showing a knob arranged at an outermostportion of the case assembly, FIG. 9 is a perspective view showing arear surface of the knob in FIG. 8 , and FIG. 10 is a perspective viewshowing a state in which a knob back plate shown in FIG. 8 is separated.

In some examples, the knob 110 has the structure directly fitted to thevalve shaft 330, but it is characterized in that the knob 110 of theknob assembly according to the present disclosure provides the knobshaft 116 separately when the valve shaft 330. As described above, theknob shaft 116 is connected to the valve shaft 330 through the joint200.

The knob 110 includes a knob body 112 that forms an appearance, a knobback plate 114, and a knob shaft 116. The knob body 112 and the knobshaft 116 may be integrally formed as a single portion and may bemanufactured as separate portions and then coupled.

In some implementations, the knob shaft 116 may be made of a metalmaterial for high strength and reliability. The knob body 112 may bemanufactured of an injection portion forming the appearance, but a metalmaterial processed goods is used in the case of an expensive productgroup.

In some examples, when the portion integrally made of the knob body 112and the knob shaft 116 is manufactured through the metal processing, thetime and cost required for manufacturing the portions become excessive.In order to manufacture the metal part having such a shape, a cuttingprocessing is generally. However, since the size of a raw material forcutting processing is increased, there are many the cut scraps, therebyincreasing the processing time and the processing unit cost.

However, even when the knob body 112 and the knob shaft 116 are the samemetal material, the processing cost may be lowered when separatelymanufacturing it, and coupling it. In this case, the knob body 112 ismanufactured by cutting processing, and the knob shaft 116 is applicableto a method of manufacturing a wire material such as rolling, etc.

At this time, the coupling between the knob body 112 and the knob shaft116 can use the method of a shrinkage fitting, an indentation, and awelding, etc.

In some examples, the knob back plate 114 coupled to the rear surface ofthe knob body 112 is advantageous from the viewpoint of cost using amolding portion because it is less exposed externally and has acomplicated shape.

The knob back plate 114 functions in order for not to be operate theknob 110 in a state without pushing the knob 110 together with a lockingbracket (140 of FIG. 11 ) described later.

The knob back plate 114 provides a guide surface 114 c extending to thecenter side of the knob shaft 116 and the guide surface 114 c provides acutting section 114 b at the portion corresponding to the position ofthe locking bracket 140 when the knob 110 is in the origin position (theposition in an off state).

In other words, when the knob is not pushed when the knob 110 is in theoff state, the locking piece (142 in FIG. 14 ) of the locking bracket ispositioned inside the cutting section 114 b, one side of the guidesurface 114 c becomes an engaging surface 114 d and interferes with thelocking bracket 140, and thus, a user may not rotate the knob 110.

When the knob 110 is pushed, the engaging surface 114 d becomes aposition corresponding to a knob passage groove 144 provided in thelocking bracket 140, and the engaging surface 114 d passes through theknob passage groove 144 and it is in a state of being able to rotate.Accordingly, in a state which the knob 110 is pushed, the knob 110 canbe rotated. General push and turn type knobs have a structure in whichthe knob 110 itself can rotate even in a state which the knob is notpressed, but the rotational force of the knob 110 is not transmitted tothe valve. The present disclosure provides a structure which cannot berotated even for the knob 110 in a state the knob 110 is pushed by usingan interference of the locking bracket 140 and the knob back plate 114,as described above.

In some examples, the engaging surface 114 d defined on the guidesurface 114 c of the knob back plate 114 may be aligned with the lockingbracket 140, and the locking bracket 140 may be aligned with the originposition of the knob body 112. Accordingly, the knob body 112 and theknob back plate 114 may be constrained and may not rotate with regard toeach other.

In some implementations, the knob back plate 114 may be fastened to theknob body 112 through the fastening hole 114 a. Although the shown knobbody 112 is shown as a straight handle shape, it may be formed simply asa conical shape, and may have a shape in which the origin position isengraved or colored, and a knob design having various other shapes maybe applied in addition to that.

Hereinafter, all configuration of the case assembly except the knob willbe described.

FIG. 11 is a view showing the separated state of all configurations ofthe case assembly, FIG. 12 is a view showing a separated state of theconfigurations arranged inside the front panel of the case assembly,FIG. 13 is a view showing a state which the configurations inside thefront panel of the case assembly is arranged, and FIG. 14 is a viewshowing a separated state of the configurations arranged to the outsidethe front panel of the case assembly, and FIG. 15 is a view showing astate which the configurations arranged outside the front panel of thecase assembly are assembled.

As shown, the case assembly 100 includes the knob (110 of FIG. 8 ), theknob ring 120, a spacing plate 130, the locking bracket 140, the supportframe 150, a spacing pipe 160, an actuating member 170, a fixed frame180, and a fixed pipe 190.

Among them, the knob 110, the knob ring 120, the spacing plate 130, andthe locking bracket 140 are arranged outside the front panel 10.

The support frame 150, the spacing pipe 160, the actuating member 170,and the fixed frame 180, and the fixed pipe 190 are arranged inside thefront panel 10.

The present disclosure provides the structure which the knob ring 120provided in the case assembly 100 is rotatable in both directions in apredetermined range and includes a knob ring sensor 500 of sensing therotation of the knob ring 120. In addition, a knob sensor 400 forsensing the amount of rotation of the knob 110 to be described later isarranged in the valve assembly 300 and connected to the valve shaft 330.

The knob ring 120 includes a knob ring body 122, a knob ring back plate124, a display device 125, a display housing 126, and a display cover127.

The knob ring body 122 forms the appearance of the knob ring 120 andserves to fix the display device 125. The display housing 126 securesinsulating performance of the display device 125, which is an electroniccomponent, and secures to be fastened to the knob ring body 122. Thedisplay cover 127 together with the knob ring body 122 forms theappearance of the knob ring 120.

The knob ring body 122 may be made of a metal material similar to theknob body 112. Since the knob ring body 122 is a portion which theuser's hand has to be continuously contacted like the knob body 112, ametal material may be used for improving a sensitive quality, improvingthe appearance quality, and improving a durability.

The display cover 127 is coupled as a form of surrounding the outersurface of the display device 125 and the display housing 126 receivedtherein. The display cover 127 may be made of a semi-translucentmaterial so that only information displayed on the display device 125can be viewed while the inner component is not visible to the outside.

Here, the translucency may be a degree of transmitting of a portion of alight emitted from a display, and does not mean of limiting the range ofa predetermined translucent ratio.

The display device 125 is coupled to the display housing 126 and thedisplay housing 126 coupled with the display device 125 is coupled tothe knob ring back plate 124, and then, the knob ring back plate 124coupled with the display housing 126 is coupled to the knob ring body122.

In some implementations, the display housing 126 and the knob ring body122 may provide the groove and the protrusion at positions correspondingto each other, so that the display housing 126 can be assembled at analigned position with regard to the knob ring body 122.

The display cover 127 which forms the appearance of the knob ring 120together with the knob ring body 122 is a structure which is fittingcoupled to the knob ring body 122 in a state which the knob ring body122 and the knob ring back plate 124 are fastened.

In some examples, a spacing plate 130 is arranged between the knob ringback plate 124 of the knob ring 120 and the front panel 10. The spacingplate 130 is a kind of thrust bearing and serves not to directly rub theknob ring 120 and the front panel 10, and maintain the predeterminedspacing between the knob ring 120 and the front panel 10.

It is possible to set the spacing between the rear surface of the knobring 120 (the rear surface of the knob ring back plate) and the outersurface of the front panel 10 by adjusting the thickness of the spacingplate 130.

The spacing plate 130 may be made of a material having a low coefficientof friction such as Teflon, and a lubricant having viscosity may beapplied to the surface of the spacing plate 130.

The configuration which is directly fastened to the front panel 10 ofthe external configurations of the front panel 10 is the locking bracket140. The locking bracket 140 serves not to rotate without pushing theknob 110 in Push & Turn method.

The locking bracket 140 is directly fastened to the front panel 10through a bracket hole 124 b provided in the knob ring back plate 124.

Since the knob ring back plate 124 rotates in both directions togetherwith the knob ring 120, the bracket hole 124 b is formed as an arc longhole in the knob ring back plate 124. It is such that the knob ring backplate 124 is rotated in a state which the locking bracket 140 isfastened to the front panel.

In addition, the spacing plate 130 is closely attached to the outersurface of the front panel 10. In the shown implementation, the spacingplate 130 is provided with a bracket groove 132 at a portioncorresponding to the fastening position of the locking bracket 140.

It is for the locking bracket 140 to be directly attached to the surfaceof the front panel 10 and fastened. However, since the spacing plate 130does not rotate with the knob ring but maintains the fixed position, itis sufficient that the bracket groove 132 is formed to have a sizecorresponding to the fastening surface of the locking bracket 140.

Of course, as another implementation, the locking bracket 140 may befastened to the front panel through the spacing plate 130. In this case,the spacing plate 130 may be provided with a fastening hole which can beextension formed to the portion corresponding to the fastening surfaceof the locking bracket 140 and can penetrate a fastening vole S3 forfastening the locking bracket 140. The locking bracket 140 can berepeatedly applied with a lateral force, and the fixing of the centerposition is important. In some implementations, the locking bracket 140may be fastened to the front panel 10 with at least two fastening boltsS3.

In some examples, the front panel 10 is provided with a wiring hole 12for passing through the wiring connected to the display device 125. Thewiring hole 12 is for passing the wiring that supplies power and asignal to the display device 125. The display device 125 is fixed to theknob ring 120 and rotates together with the knob ring 120 so that thewiring is rotated together with the knob ring 120. Therefore, the wiringhole 12 is formed as an arc-shaped long hole.

The support frame 150, the spacing member 160, the actuating member 170,the fixed frame 180, the fixed pipe 190, and the knob ring sensor 500 ofFIG. 12 are arranged inside the front panel 10.

The support frame 150 is directly fastened to the front panel 10 throughthe fastening bolt S1 penetrating through the front panel 10 in a statewhich is arranged on the inner surface of the front panel 10. The headof the fastening bolt S1 is inserted into the bolt receiving hole 133 ofthe spacing plate 130 to serve as a fixing protrusion for fixing theposition of the spacing plate 130.

The support frame 150 provides a pair of spring fixing portions 155 towhich the restoring springs 156 a and 156 b of providing the restoringforce of the actuating member 170 are fixed. In addition, a restoringmagnet 158 is fixed to the support frame 150 so that the actuatingmember 170 can have a fixing force at the origin.

The actuating member 170 is fitted inside the support frame 150 and thenis fastened to the knob ring 120 through a fastening bolt S2. Thus, theactuating member 170 can rotate integrally with the knob ring 120. Theactuating member 170 provides the spring fixing portion 175 to which therestoring spring 156 a, 156 b is fixed. The spring fixing portion 175 ofthe actuating member 170 is arranged between the spring fixing portions155 of the support frame 150 and they are connected by a pair ofrestoring spring 156 a, 156 b.

When the knob ring 120 is rotated to one side, it is configured suchthat one restoring spring is tensioned and the other restoring spring iscompressed. When the external force applied to the knob ring 120 isreleased, it is configured such that the knob ring 120 can be returnedto the origin position by the elastic force of the restoring spring 156a, 156 b.

In addition, the actuating member 170 is provided with a restorationmagnet 178 paired with the restoration magnet 158 of the above-mentionedsupport frame 150. The restoring magnet 158 arranged in the supportframe 150 and the restoring magnet 178 arranged in the actuating member170 are arranged at a position corresponding to each other such that theknob ring 120 is the closest position in a state which it is located atthe origin.

In the illustrated implementation, four fastening bolts S2 are appliedto firmly fasten the actuating member 170 having a cylindrical shape andthe knob ring back plate 124. However, three fastening bolts S2 can befastened at a spacing of 120°.

In some examples, the actuating member 170 is partially protruded fromthe front surface of the front panel 10 through the support frame 150 soas to be in direct contact with the knob ring back plate 124 and can befastened. This is to make the actuating member 170 protruding outsidethe front panel 10 support the knob ring back plate 124.

The actuating member 170 includes an operating portion 171 inserted intothe support frame 150, a support portion 172 formed in a flange shape atthe inner end of the operating portion 171, and an extended portion 173from both sides of the support portion 172 to the outside. A springfixing portion 175 is provided on the extended portion 173 on one side.

In addition, the extended portion 173 is provided with a magnet groove177 into which the restoring magnet 178 is inserted. The restorationmagnet 178 fixed to the actuating member 170 is arranged so as togenerate a magnetic force in a direction closely attached to therestoring magnet 178 fixed to the support frame 150. It is for theactuating member 170 to be fixed by the attaching power of the restoringmagnets 158,178 at the origin position.

In addition, the outer circumferential surface of the actuating member170 operates by the rubbing with the inner surface of a support framethrough hole 151 of the support frame 150.

In some examples, the spacing member 160 is made of Teflon, etc. havinga low coefficient of friction like the spacing plate 130 and insertedbetween the outer circumferential surface of the actuating member 170and the inner circumferential surface of the support frame through hole151. The spacing member 160 may be formed in a cylindrical shape whichone surface is cut so as to have a variable diameter.

In the case of the illustrated implementation, the spacing plate 130 andthe spacing member 160 are shown as separate portion. However, thespacing plate 130 and the spacing member 160 are made of the samematerial such as Teflon having a low coefficient of friction and theymay be integrally formed as a single part because there are the portionswhich are in contact with each other.

In addition, a lubricant (for example, grease) for reducing the rubbingand the noise can be applied to the surface of the spacing plate 130 andthe spacing member 160.

The fixed frame 180 secures to support the rear surface of the actuatingmember 170 to prevent the actuating member 170 from being pushed andentered into the inside of the front panel.

The fixed frame 180 may be provided for convenience of the assembly. Theactuating member 170 has to be fastened to the knob ring 120 asdescribed above. When the fixed frame 180 is not provided, a fasteningwork has to be performed in a state when the knob ring 120 and theactuating member 170 are fixed by hands or a tool.

However, when the fixed frame 180 is provided, when the actuating member170 is inserted into the support frame 150 and the fixed frame 180 isfastened to the rear surface of the actuating member 170, the actuatingmember 170 cannot deviate from the support frame 150. Therefore, whenthe knob ring 120 is assembled, the knob ring 120 is aligned to theactuating member 170 on the front side of the front panel, and then thefastening operation can be performed, and thus, workability is improved.The fixed frame 180 has a rotatable region 182 that defines a rotationangle of the extended portion 173 of the actuating member 170.

In addition, since the actuating member 170 is integrally rotated withthe knob ring 120, the knob ring sensor 500 senses the knob ring sensormagnet 530 fixed to the actuating member 170 and can recognize theoperation of the knob ring 120.

The knob ring sensor 500 is fastened to the support frame 150 directlyfastened to the front panel 10. Since the knob ring sensor 500 issufficient to be fixed at a position close to the actuating member 170,it may be fastened to the fixed frame 180 or directly fastened to thefront panel 10, depending on the shape.

In addition, a fixed pipe 190 is fastened to the rear surface of thefixed frame 180. The fixed pipe 190 serves to support the knob shaft 116provided on the knob 110 and guide the assembly of the joint 200.

Referring to FIG. 14 , the head of the fastening bolt S1 of fixing thesupport frame 150 and the front panel 10 is a state exposed on the outersurface of the front panel 10. An appearance exposure of the fasteningbolt S1 results in a degradation of the appearance quality.

In some examples, in order to make the knob ring 120 rotate in bothdirections, a gap may be defined between the knob ring 120 and the frontpanel 10.

As described above, the gap between the knob ring 120 and the frontpanel 10 can be secured by the spacing plate 130. In addition, thepresent disclosure provides a structure in which the spacing plate 130surrounds the support frame fastening bolt S1 to which the appearance isexposed, so that the fastening bolt S1 is not externally exposed.

Of course, since the knob ring 120 is arranged on the front surface ofthe fastening bolt S1, the fastening bolt S1 is not exposed on the frontsurface. However, when the user views it from the side, this is becausethat the fastening bolt S1 can be viewed through a gap (a gap for therotation of the knob ring) between the knob ring 120 and the front panel10.

For this, the spacing plate 130 is provided with a bolt receiving hole133 at a position corresponding to the support frame fastening bolt S1.In addition, the spacing plate 130 has a through hole 135 at the centerand an inner circumferential surface of the through hole 135 has thesurface of being supported by the actuating member 170 protruding to theoutside the front panel 10.

Therefore, the spacing plate 130 may not require separate fastening.This is because the knob ring 120 which is closely attached to the frontsurface of the spacing plate 130 is fastened to the actuating member 170with the front panel 10 therebetween.

Next, the assembly structure of the knob ring 120 will be described inmore detail.

FIG. 16 is a perspective view showing an appearance in a state which theknob ring is assembled, and FIGS. 17 and 18 are the exploded perspectiveviews for explaining an assembling structure of the knob ring.

As shown, the knob ring body 122 has a ring shape surrounding the rearsurface of the knob, and the remaining portions except the portionpenetrating through the knob shaft 116 at the center are covered by theknob ring back plate 124.

The knob ring body 122 has a protruding portion 122 a that covers bothsides of the display device 125 on the upper side. The protrudingportion 122 a provides a structure for fixing the display device 125while securing to protect the side of the display device 125. Inaddition, the protruding portion 122 a of the knob ring body 122 can beused as a handle when the user operates the knob ring body 122.

When rotating a circular product, the force to rotate only through thefrictional force of the surface is transmitted. There are many casesthat it is not easy to secure a frictional force in a kitchenenvironment having many cases that a lot of water is used and the glovesare used by wearing.

In this case, when the protruding portion 122 a is on one side of thering shape, by pushing it, the protruding portion in the rotatingdirection, the rotating force can be transmitted. For example, when theknob ring 120 is to be rotated in clockwise, the side of the leftprotruding portion 122 a may be pressed to the right side. In someexamples, when the knob ring 120 is to be rotated counterclockwise, theside of the right protruding portion can be pressed to the left.

The knob ring body 122 provides a knob ring back plate 124 and afastening hole 122 h for fastening. Although four fastening holes 122 hare provided for firm and accurate fastening of the shownimplementation, the number of fastening holes 122 h may vary dependingon the fastening structure, the size of the knob ring 120, etc.

When the protruding portion 122 a is provided on the upper part of theknob ring body 122 and the display device 125 is inserted therebetween,both sides and the bottom surface of the display device 125 aresurrounded by the knob ring body 122. In addition, the display cover 127is coupled in a form of covering the upper surface of the display device125 and the rear surface of the display device 125 is coupled to theknob ring back plate 124. As a result, all of six sides of the displaydevice are wrapped, and provide the structure which the display device125, which is vulnerable to moisture and impact, can be securely coupledto the knob ring 120.

A protrusion 122 a and a groove 122 b for constraining the displayhousing 126 to a center position are provided inside the protrudingportion 122 a of the knob ring body 122.

The knob ring body 122 may be made of a metal material like the knobbody 112. The knob body 112 and the knob ring body 122 are the portionsexposed to the appearance, and are the portions which the user's handsare repeatedly contacted and may be manufactured of a metal material forimproving durability and appearance quality.

In some examples, the knob ring body 122 is fastened to the knob ringback plate 124 and the fastening bolt S5 is fastened at the knob ringback plate 124 side. It is for the fastening bolt S5 not to be exposedto the appearance, thereby resulting in an effect of improving theappearance quality.

The rear surface of the knob ring back plate 124 provides an innercircular plate area 124 j in which the actuating member 170 is receivedand a donut-shaped outer circular plate area 124 k formed outside theinner circular plate area 124 j. A spacing plate 130 is received insidethe outer circular plate area 124 k.

The side of the inner circular plate area 124 j surrounds and supportsthe outer circumferential surface of the actuating member 170 while theside of the outer circular plate area 124 k surrounds and supports theouter surface of the spacing plate 130. Such a structure provides astructure that allows the knob ring 120 to stably rotate in bothdirections at the center position.

The spacing between the knob ring back plate 124 and the front panel 10can be adjusted by adjusting the thickness of the spacing plate 130 andthe recessed depth of the outer circular plate area.

For example, when the thickness of the spacing plate 130 is set to be0.2 mm larger than the recessed depth of the outer circular plate area124 k, the spacing between the knob ring back plate 124 and the case isset to 0.2 mm.

This serves to prevent a scratch from being generated on the surface ofthe front panel 10 by directly rubbing to the knob ring back plate 124on the surface of the front panel 10. Since the knob ring back plate 124has a shape in which the upper portion arranged with the display device125 is protruded, when the scratch is generated in this portion, evenwhen the knob ring is in the origin position, the scratch portion can beexposed externally to left and right.

The display device 125 is fastened to the knob ring back plate 124. Thedisplay device 125 is provided with a fastening hole 125 d and the knobring back plate 124 is provided with a fastening hole 124 e at aposition corresponding to the fastening hole 125 d of the display device125.

In addition, the display housing 126 coupled to the display device 125has a fastening boss 126 d at a position aligned with the fasteningholes 124 e and 125 d. A fastening bolt S4 inserted in the knob ringback plate 124 sequentially passes through the fastening hole 124 e ofthe knob ring back plate 124 and the fastening hole 125 d of the displaydevice 125, and then, is fastened to the fastening boss 126 d of thedisplay housing 126. The knob ring back plate 124, the display device125, and the display housing 126 are integrally fastened through thefastening bolt S4.

In other words, the fastening is made in a state that the display device125 is fitted between the knob ring back plate 14 and the displayhousing 126. As described above, the knob ring body 122 may be made of ametal material. In order to prevent the display device 125 included withan electronic circuit from being a short circuit with the knob ring body122, the display housing 126 may be made of an insulating material.Through this, stable operation performance of the display device 125 canbe secured.

The display housing 126 may be formed as a frame form that surrounds theouter circumferential surface of the display device 125.

In addition, the fastening boss 126 d of the display housing 126 formsthe guide protrusion 126 b to the front side of the display housing 126.The guide protrusion 126 b is inserted into the receiving groove 122 bprovided on the rear surface of the protruding portion of the knob ringbody 122 to provide a structure in which the display housing 126 can becoupled in a state aligned with the knob ring body 122.

FIG. 19 is a perspective view showing a display device, and FIG. 20 is aperspective view showing a rear surface of a display device of a knobassembly according to the present disclosure.

As shown, the display device 125 of the knob assembly according to thepresent disclosure includes a display board 125 b and a display module125 a. A connector 125 c is provided on the rear surface of the displayboard 125 b. In addition, the display board 125 b is formed larger thanthe display module 125 a to the both sides. The display board 125 bexposed to both sides of the display module 125 a is provided with afastening hole 125 d.

The above described knob ring back plate 124, the display device 125,and the display housing 126 are fastened through the fastening hole 125d. The display module 125 a may be configured to be of a type that thelight is emitted.

FIG. 21 is a perspective view showing a display housing, and FIG. 22 isa perspective view showing a rear surface of a display housing.

The display housing 126 has a frame shape that surrounds the outersurface of the display device 125. The display housing 126 is coupled ina form of fitting with the display device 125, and the knob ring backplate 124 is fastened having the display device 125 therebetween by thefastening volt S4.

The display housing 126 includes a frame portion 126 f surrounding thedisplay module 125 a of the display device 125 and a wing portion 126 wsurrounding the display board 125 b.

The display housing 126 may be manufactured by a method of injectionmolding with a material having an insulating material. Insulationperformance of the display housing 126 may provide protection for thedisplay device 125 that includes electronic components.

The display housing 126 fixes the display device 125 and is coupled tothe knob ring body 122.

The coupling of the display housing 126 and the knob ring body 122 is astructure for allowing the display housing 126 to be fixed in the centerposition with regard to the knob ring body 122 by a fitting couplingstructure.

The display housing 126 is fastened to the knob ring back plate 124 bythe fastening volt S4 having the display board 125 b of the displaydevice 125 therebetween and is not substantially fastened to the knobring body 122. In addition, since the knob ring back plate 124 isfastened to the knob ring body 122, the display housing 126 has thestructure of fastened to the knob ring body 122 through the knob ringback plate 124.

Since the display housing 126 is not directly fastened to the knob ringbody 122, a structure for a position alignment with regard to the knobring body 122 of the display housing 126 is needed.

For this, the present disclosure includes a guide protrusion 126 b onthe front surface of a wing portion 126 w of the display housing 126,and provides a guide groove 126 c on a side.

In addition, a front support portion 126 a is provided on the forwardside of the frame portion 126 f. The front support portion 126 a isprotruded in a form of blocking the through hole exposed with thedisplay device 125 and supports the front surface of the display module125 a, thereby serving to prevent the front surface of the displaymodule 125 a from being protruded at the display housing 126.

Referring to the rear surface of the display housing 126, the fasteningboss 126 d is provided. The fastening bolt S4 fastened through the knobring back plate 124 is fastened to the fastening boss 126 d. Thefastening boss 126 d is connected to the guide protrusion 126 b on thefront surface of the display housing 126 on a straight line. In otherwords, the fastening hole of the fastening boss 126 d is connected tothe inside the guide protrusion 126 b.

In addition, a rear support portion 126 e is provided on the rearsurface of the frame portion of the display housing 126. The rearsupport portion 126 e is supported on the front surface of the knob ringback plate 124 contacting with the rear surface of the display housing126, thereby securing to prevent the knob ring back plate 124 fromentering inside the display housing 126.

FIG. 23 is a perspective view showing a rear surface of a knob ring, andFIGS. 24 and 25 are the views for explaining a coupling structure of thedisplay device and the knob ring of the knob assembly according to thepresent disclosure.

As shown, the knob ring body 122 is provided with a pair of protrudingportion 122 a at an upper portion. A display is coupled between theprotrusion 122 a.

The display device 125 is constrained to the knob ring body 122 throughthe display housing 126 described above.

The receiving groove 122 b to which the guide protrusion 126 b of thedisplay housing 126 is provided inside the protruding portion 122 a ofthe knob ring body 122 and the guide rail 122 c to which a guide groove126 c of the display housing 126 is inserted is provided to the innerside of the protruding portion 122 a.

As shown, the display housing 126 has the structure which is fittingcoupled between the protruding portion 122 a of the knob ring body 122in a state of fitting the display device 125 to the display housing 126.

When the guide protrusion 126 b of the display housing 126 is insertedinto the receiving groove 122 b of the knob ring body 122, it canprevent the up and down and left and right flow of the display housing126.

In addition, the guide rail 122 c of the knob ring body 122 is insertedinto the guide groove 126 c of the display housing 126 to guide thecoupling of the display housings 126 and prevent the up and downdirections deviation of the display housing 126.

In addition, a coupling hole 122 h for fastening with the knob ring backplate 124 is provided on the rear surface of the knob ring body 122. Ina state which the knob ring body 122 is directly fastened to the knobring back plate 124 and the display device 125 is fastened to the knobring back plate 124 together with the display housing 126, the knob ringback plate 124 is fastened to the knob ring body 122 and inserted intobetween the protruding protrusion 122 a of the knob ring body 122 andfixed.

In some examples, the upper surface groove 122 t is provided on theupper surface of the protruding portion 122 a of the knob ring body 122.The upper surface groove 122 t is a configuration for coupling with thedisplay cover 127.

FIG. 26 is a perspective view showing a knob ring back plate, FIG. 27 isa perspective view showing a rear surface of a knob ring back plate, andFIG. 28 is a longitudinal sectional view of the knob ring back plate ofthe knob assembly in accordance with an exemplary implementation of thepresent disclosure.

As shown, the knob ring back plate 124 can be largely divided into threeportion, a circular plate portion 124-1, an extended portion 124-2, andsupporting pipe portion 124 c, 124 f.

The circular plate portion 124-1 has a circular plate shaped outershape, and the extended portion 124-2 has a shape protruded outward soas to shield the rear surface of the protrusion of the knob body.

The supporting pipe portion includes an outer supporting pipe 124 cprotruded toward outside of the front panel and an inner supporting pipe124 f protruding toward inside of the front panel. The outer supportingpipe 124 c and the inner support pipe 124 f are formed on the same axis,and a knob shaft insertion hole 124 d is formed therein.

The circular plate portion 124-1 includes an inner circular plate area124 j having a size corresponding to the actuating member 170 again andan outer circular plate area 124 k having a size corresponding to thespacing plate 130.

The supporting pipe portion 124 c, 124 f is formed in a form protrudedfrom the center of the circular plate portion 124-1 to both sides. Thesupporting pipe portions 124 c, 124 f serve to support the knob shaft116 inserted therein. The knob shaft 116 and the supporting pipe portion124 c, 124 f serves to mutually support. When the knob is operated, itis supported by the supporting pipe portion 124 c, 124 f to which theknob shaft is fixed. When the knob ring is operated, the supporting pipeportions 124 c, 124 f is supported by the knob shaft inserted therein.

The outer circular plate area 124 k of the knob ring back plate 124 isprovided with a fastening hole 124 h for fastening with the knob body112 and the inner circular plate area 124 j is provided with thefastening hole 124 i for fastening with the actuating member. Throughthis, the knob body 112 and the actuating member 170 are fastened withthe knob ring back plate 124 as the medium.

In addition, the outer circular plate area 124 k of the knob ring backplate 124 is provided with a bracket hole 124 b through which thelocking bracket penetrates and is coupled to the front panel. Thebracket hole 124 b is formed into an arc shape long hole by reflectingthe rotation range of the knob ring.

In some examples, the inner supporting pipe 124 f is divided into cutsection 124 g so as to have a flexibility. This is to allow the innersupporting pipe 124 f to be smoothly assembled with other componentduring the assembly process.

The inner supporting pipe 124 f is assembled in a form inserted insidethe fixed frame 180 and the fixed pipe 190 are inserted inside, and atthis time, when an outer diameter of the inner supporting pipe 124 f iscontracted, the assembly convenience can be improved. Therefore, theinner supporting pipe 124 f is divided into the cut section 124 g sothat the outer diameter of the inner supporting pipe 124 f can becontracted during the assembly process.

In some implementations, the cut section 124 g cuts the inner supportingpipe 124 f in the lateral direction. This results in an effect that theinner supporting pipe 124 f can reduce the up and down external diameterin the up and down direction due to the pressure in the up and downdirection during the assembling process.

The extended portion 124-2 is provided with a fastening hole 124 e forfastening the display board 125 b and the display housing 126 together.The fastening bolt S4 entering from the rear surface of the knob ringback plate 124 is fastened to the fastening boss 126 d of the displayhousing 126 after passing through the fastening hole 125 d of thedisplay board 125 b.

In addition, the extended portion 124-2 is provided with a wiring hole124 a through which the wiring connected to the connector 125 c providedon the rear surface of the display board 125 b passes. The assembling ofthe wiring is made after the assembly of the knob ring 120. Afterassembling the knob ring 120 to the front panel, the wiring is coupledto the connector 125 c exposed through the wiring hole 124 a.

The inner circular plate area 124 j of the circular plate portion 124-1has a shape protruded forward compared with the outer circular platearea 124 k. This is such that the actuating member 170 is inserted intothe inner circular plate area 124 j so that the side of the actuatingmember can be supported by the side of the inner circular plate area 124j. A spacing plate 130 is received inside the outer circular plate area124 k so that the outer surface of the spacing plate 130 is supported bythe side of the outer circular plate area 124 k.

The knob ring back plate 124 has a complicated shape to be fastened toother configurations, and it is advantageous in manufacturing costaspect to manufacture by injection molding.

FIG. 29 is a view for explaining the assembly of the display cover ofthe knob assembly in accordance with an exemplary implementation of thepresent disclosure, FIG. 30 is a perspective view showing the displaycover of the knob assembly in accordance with an exemplaryimplementation of the present disclosure, FIG. 31 is a half crosssectional view showing the display cover of the knob assembly inaccordance with an exemplary implementation of the present disclosure,FIG. 32 is a sectional view showing a state before the display cover ofthe knob assembly in accordance with an exemplary implementation of thepresent disclosure is coupled, and FIG. 33 is a sectional view showing astate which the display cover of the knob assembly in accordance with anexemplary implementation of the present disclosure is coupled.

As shown, the display cover 127 is configured to be coupled with thefitting coupling at the supper portion of the protrusion of the knobring body 122 after the knob ring body 122, the knob ring back plate124, the display device 125, and the display housing 126 are assembled.

The display cover 127 together with the knob ring body 122 forms theappearance of the knob ring.

The knob ring body 122 has a slot groove 122 d into which the insertionprotrusion 127 a formed at a lower end of the display cover 127 isfitted. The insertion protrusion 127 a is formed at the lower end of thefront surface of the display cover 127 and is inserted into the slotgroove 122 d of the knob ring body 122. The insertion protrusion 127 aof the display cover 127 is fitted into the slot groove 122 d of theknob ring body 122 so that the surface of the display cover 127 alignswith the outer surface of the knob ring body 122 and is constrained.However, the insertion protrusion 127 a is not fixed to the slot groove122 d, and thus, the fastening force is not generated due to thecoupling of the insertion protrusion 127 a and the slot groove 122 d.

A pair of restraining protrusion 127 b is provided on the upper bottomsurface of the display cover 127. The restraining protrusion 127 b isresiliently deformed and inserted into the protruding portion 122 a ofthe knob ring body 122 and then restrained by the upper inner surface ofthe protruding portion 122 a. The coupling force of the display cover127 is secured by the restraining protrusion 127 b.

In addition, a pair of side support protrusions 127 t are provided onboth sides of the upper bottom surface of the display cover 127. Theside supporting protrusion 127 t is fitted into the upper surface groove122 t provided on the upper surface of the knob ring body 122. The pairof side supporting protrusion 127 t is constrained to the upper surfacegroove 122 t provided in the protruding portion 122 a in both sides,respectively and aligns the coupling of the knob ring body 122 with thedisplay cover 127.

In addition, a rear surface supporting protrusion 127 c is provided onthe upper bottom surface of the display cover 127. The rear surfacesupporting protrusion 127 c supports the front surface of the knob ringback plate 124 to align the coupling of the knob ring back plate 124 andthe display cover.

In addition, the display cover 127 has a thin walled portion 127 fhaving a thickness thinner than the other portion in a portioncorresponding to the display portion area of the display module 125 a.

In some implementations, since the display cover 127 may define theappearance, the display cover 127 may be made of a translucent materialso as not to expose an inside complicated shape to the outside. By theway, the transmittance of the translucent material can be controlled bythe thickness. When the portion corresponding to the display portionarea of the display module 125 a is made thinner than the other area, itis possible to reduce a change in brightness or color of light emittedfrom the display module 125 a.

Next, the structure of the joint will be described.

FIG. 34 is a cross section showing a state which the joint is separatedfrom the knob assembly in accordance with an exemplary implementation ofthe present disclosure, FIG. 35 is a perspective view showing a joint ofthe knob assembly in accordance with an exemplary implementation of thepresent disclosure, and FIG. 36 is an exploded perspective viewillustrating a joint of the knob assembly in accordance with anexemplary implementation of the present disclosure. FIG. 37 is alongitudinal cross section showing a joint of the knob assembly inaccordance with an exemplary implementation of the present disclosure,FIG. 38 is a transverse sectional view showing the joint of the knobassembly in accordance with an exemplary implementation of the presentdisclosure, FIGS. 40 and 41 are the views for explaining a rotationoperation of the joint of the knob assembly in accordance with anexemplary implementation of the present disclosure.

The joint 200 serves to connect the case assembly 100 and the valveassembly 300.

The joint 200 is fitted to the knob shaft 116 provided in the knob andthe valve shaft 330 provided in the valve assembly.

The joint 200 is installed between the valve shaft 330 and the knobshaft 116 and connects the valve shaft 330 and the knob shaft 116, andit includes the joint housing 210 and the first shaft coupling portion220, the second shaft coupling portion 230, a joint spring 260, areinforcement insert ring 240, and a reinforcement cap 250.

The joint housing 210 has a predetermined length and is formed into acylindrical shape formed with a hollow. At one side of the longitudinaldirection of the joint housing 210, a hollow, that is, an insertionportion for opening the inner space of the joint housing 210 to theoutside of the joint housing 210 is formed. In addition, a side plateportion 214 of blocking a longitudinal other side of the joint housing210 is provided on the side facing with the insertion portion, that is,the longitudinal other side of the joint housing 210. A through hole 214a for opening the inner space of the joint housing 210 to the outside ofthe joint housing 210 is formed in the inner side of the side plateportion 214.

Also, a plurality of slots 216, 218 may be formed in the joint housing210. Each slot 216, 218 is formed in a long hole shape extending alongthe longitudinal direction of the joint housing 210 and may be formed asthe long hole shape having a predetermined width extending along thecircumferential direction of the joint housing 210 and the predeterminedlength along the longitudinal direction of the joint housing 210.

According to the present implementation, the joint housing 210 is formedwith a pair of first slot 216 and a pair of second slot 218.

The pair of first slot 216 is formed to be penetrated to the side of thejoint housing 210, respectively, and viewed from longitudinal one sideor other side of the joint housing 210, it is arranged to face eachother.

In addition, the pair of second slot 218 is formed to be penetrated tothe side of the housing forming a curved surface, respectively, andviewed from longitudinal one side or other side of the joint housing210, it is arranged to face each other at a position different from thefirst slot 216.

That is, viewed from longitudinal one side or other side of the jointhousing 210, the pair of first slot 216 and second slot 218 are arrangedto form a cross shape.

The pair of first slot 216 arranged to face each other is inserted withthe first coupling shaft 225 arranged to in a row to the first shaftcoupling portion 220 such that the straight line direction movement andthe rotation to the longitudinal direction of each joint housing 210 arepossible. Further, the pair of second slot 218 arranged to face eachother is inserted with the pair of the second coupling shaft 235arranged in a row to the second shaft coupling portion 230 such that thestraight line direction movement and the rotation to the longitudinaldirection of the joint housing 210 are possible, respectively.

By the fitting coupling made between the pair of the first slot 216 andthe first coupling shaft 225, the straight line direction movement andthe rotation of the first shaft coupling portion 220 are possible to thejoint housing 210. In addition, by the fitting coupling between the pairof the second slot 218 and the second coupling shaft 235, the straightline movement and the rotation of the second shaft coupling portion 230can be coupled to the joint housing 210.

The first shaft coupling portion 220 is inserted to the inner space ofthe joint housing 210 through the insertion portion. Such first shaftcoupling portion 220 is connected to any one of the valve shaft 330 andthe knob shaft 116, and it includes the first coupling shaft 225 and thefirst shaft coupling pipe 227. In the present implementation, the firstshaft coupling portion 220 is exemplified as being connected with thevalve shaft 330.

The first shaft coupling portion 220 is inserted into the inner space ofthe joint housing 210 and coupled to the joint housing 210 by the pairof first coupling shaft 225 arranged in a row, and thus, it can be movedand rotated integrally with the first coupling shaft 225.

The first shaft coupling pipe 227 is formed to be extended to thelongitudinal direction of the joint housing 210 and protruded outsidethe joint housing 210, and can be moved and rotated integrally with thefirst shaft coupling portion 220. The first shaft coupling pipe 227 isthe part provided for connecting between the first shaft couplingportion 220 and the valve shaft 330, and the knob shaft 116 is coupledto the first shaft coupling pipe 227, and thus, the connection betweenthe first shaft coupling pipe 220 and the valve shaft 330 is made.

The first shaft coupling pipe 227 is protruded to the outside the jointhousing 210 via the longitudinal other side of the joint housing 210 andcoupled with the valve shaft 330 from the outside the joint housing 210and can be protruded to the outside the joint housing 210 by passingthrough the side plate portion 214 via the secured passage by thethrough hole 214 a formed to be penetrated inside the side plate portion214.

According to the present implementation, the rotation of the first shaftcoupling portion 220 is made about the first coupling shaft 225 by therotation of the first coupling shaft 225, a direction to which the endof the first shaft coupling pipe 227 faces can be changed as an angle bywhich the first shaft coupling portion 220 is rotated. Hereinafter, thedirection to which the end of the first shaft coupling pipe 227 faceswill be expressed as a position of the first shaft coupling portion 220is changed.

The second shaft coupling portion 230 is inserted into the inner spaceof the joint housing 210 through the insertion portion and arrangedbetween the insertion portion and the first shaft coupling portion 220.The second shaft coupling portion 230 is connected to other one of thevalve shaft 330 and the knob shaft 116 and may include a second couplingshaft 235 and a second shaft coupling pipe 237. In the presentimplementation, the second shaft coupling portion 230 is illustrated asbeing connected to the knob shaft 116.

The second shaft coupling portion 230 is inserted into the inner spaceof the joint housing 210 and is coupled to the joint housing 210 by apair of second coupling shafts 235 arranged in a row, and can be movedand rotated integrally with the second coupling shaft 235.

The second shaft coupling pipe 237 is formed to extend in thelongitudinal direction of the joint housing 210 and is protruded to theoutside the joint housing 210, and can be moved and rotated integrallywith the second shaft coupling portion 230. The second shaft couplingpipe 237 is the portion provided for the connection between the secondshaft coupling portion 230 and the knob shaft 116. The knob shaft 116 iscoupled to the second shaft coupling pipe 237, and thus, the connectionbetween second shaft coupling portion 230 and the knob shaft 116 can bemade.

The second shaft coupling pipe 237 protrudes to the outside of the jointhousing 210 through longitudinal one side of the joint housing 210 andis coupled to the knob shaft 116 from the outside the joint housing 210,and may be protruded to the outside the joint housing 210 through thesecured passage by the insertion portion.

According to the present implementation, when the rotation of the secondshaft coupling portion 230 is made about the second coupling shaft 235by the rotation of the second coupling shaft 235, the direction to whichthe end of the second shaft coupling pipe 237 faces may be changed bythe angle at which the second shaft coupling portion 230 is rotated.Hereinafter, the direction to which the end of the second shaft couplingpipe 237 changes will be expressed as a change in the posture of thesecond shaft coupling portion 230.

The joint spring 260 is inserted into the inner space of the jointhousing 210 through the insertion portion and arranged between the firstshaft coupling portion 220 and the second shaft coupling portion 230.The joint spring 260 provides elastic force for recovering the positionsof the first shaft coupling portion 220 and the second coupling portion230 changed by the straight line direction movement of the shaftcoupling portion 220, 230, and a posture of the first shaft couplingportion 220 and the second shaft coupling portion 230 changed by therotation of the shaft coupling pipe 227, 237.

In the present implementation, the joint spring 260 is illustrated asincluding a coil spring formed to have a length extended along thelongitudinal direction of the joint housing 210. Longitudinal one sideof the joint spring 260 is coupled to the first shaft coupling portion220 and the longitudinal other side of the joint spring 260 is coupledto the second shaft coupling portion 230. The joint spring 260 isprovided such that an elastic stretch to the longitudinal direction andthe elastic bending deformation to the rotational direction of the firstshaft coupling portion 220 or the second shaft coupling portion 230.

The inner surfaces of the first shaft coupling portion 220 and thesecond shaft coupling portion 230 facing each other, for example, theouter surface of the support boss 224, 234 is formed with a fittinggroove 222, 232 fitting coupled on the longitudinal both sides of thejoint spring 260.

Both ends of the joint spring 260 becomes a state received in thefitting groove 222 provided in the first shaft coupling portion 220 andthe fitting groove 232 provided in the second shaft coupling portion230. In addition, since the supporting boss 224 of the first shaftcoupling portion 220 and the support boss 234 of the second shaftcoupling portion 230 become an inserted state inside the joint spring260, the elastic force is provided to the direction which the spacingbetween the first shaft coupling portion 220 and the second shaftcoupling portion 230 is spaced apart in a state to which the jointspring 260 is stably fixed.

In the joint 200, the first shaft coupling portion 220 is rotatablycoupled to the joint housing 210 in any one of the up and down directionand the left and right direction, and the second shaft coupling portion230 is rotatably coupled to the joint housing 210 in the other onedirection of the up and down direction and the left and right direction.

That is, the joint 200 of the present implementation can transmit therotational motion of the knob shaft 116 to the valve shaft 330 whileconnecting the valve shaft 330 and the knob shaft 116 with one flexibleshaft in a form which the first shaft coupling portion 220 is connectedto the valve shaft 330 and the second shaft coupling portion 230 isconnected to the knob shaft 116.

When the direction to which the valve shaft 330 extends does notcoincide or align with the direction to which the knob shaft 16 extendsdue to the tolerance of the valve shaft 330 generated in the valveassembly 300, with regard to the joint 200, as a posture of at least anyone of the first shaft coupling portion 220 and the second shaftcoupling portion 230 changes, the connecting angle between the firstshaft coupling portion 220 and the second shaft coupling portion 230 ischanged, thereby absorbing the tolerance of the valve shaft 330generated in the valve assembly 300.

At this time, in the process of connecting the joint 200 to the valveshaft 330 and the knob shaft 116, the operator does not have to adjustthe connection angle between the first shaft coupling portion 220 andthe second shaft coupling portion 230. When the valve shaft 330 and theknob shaft 116 are connected to both ends of the joint 200 so that thepostures of the first shaft coupling portion 220 and the second shaftcoupling portion 230 are changed to a state for suitable to connect thevalve shaft 330 and the knob shaft 116.

In some examples, since the postures of the first shaft coupling portion220 and the second shaft coupling portion 230 can be maintained orchanged according to the situation by the elastic force provided by thejoint spring 260, separate work for fixing these postures may not berequired.

In some example, the joint 200 according to the implementation of thepresent disclosure also serves to transmit a longitudinal motion of theshaft.

As shown in FIG. 39 , in a state which the joint 200 is assembled to theknob assembly, it has the state which the joint spring 260 iscompressed. At this time, the support boss 224 of the first shaftcoupling portion 220 and the support boss 234 of the second shaftcoupling portion 230 are spaced apart from by a predetermined spacing.However, when the stroke in which the knob is pushed is greater than thespacing between the supporting boss 224, 234, the axial motion of thefirst shaft coupling portion 220 is transmitted to the motion of thesecond shaft coupling portion 230, and thus, the valve shaft 330 can bepushed.

The structure may result in an effect that the longitudinal error of theshaft can be absorbed at a spacing between the supporting boss 224, 234even when the longitudinal error or the tolerance of the shaft isgenerated in a manufacturing process of the knob shaft 116 or the valveshaft 330.

The reinforcement cap 250 is coupled to the outside the shaft couplingpipe 227, 237 and a reinforcement insert ring 240 is coupled inside theshaft coupling pipes 227, 237. The reinforcement cap 250 and thereinforcement insert ring 240 can be coupled in a fixing method. Theknob shaft 116 and the valve shaft 330 inserted into the shaft couplingpipe 227, 237 have a D-shaped cross section. The shaft coupling pipe227, 237 is continuously subjected to a torsion torque in a state whichthe knob shaft 116 and the valve shaft 330 are coupled. The first shaftcoupling portion 220 and the second shaft coupling portion 230 may bemanufactured by an injection molding method using a synthetic resinmaterial. In this case, the shaft coupling pipe 227, 237 is a syntheticresin material. In some examples, it is general that the knob shaft 116and the valve shaft 330 are the metal material.

When the torsion torque is continuously subjected in a state which theknob shaft 116 having a D-shaped cross section and the valve shaft 330are coupled inside the shaft coupling pipe 227, 237 which is thesynthetic resin material, the shaft coupling pipe 227, 237 can bedamaged.

In order to secure the durability of the shaft coupling pipe 227, 237,it has the structure that the reinforcement cap 250 of metal materialsurrounds the outer circumferential surface of the shaft coupling pipe227, 237, and the reinforcement insert ring 240 surrounds the innercircumferential surface of the shaft coupling pipe 227, 237.

Such structure reinforces the strength of the shaft coupling pipe 227,237, thereby improving the durability of the joint 200.

In some examples, the reinforcement insert ring 240 is provided with aslit 242. The slit 242 serves to secure the flexibility such that it canbe restored to the original shape after the cross section of thereinforcement insert ring 240 is changed by corresponding to therotating valve shaft 330 or the knob shaft 116, even when the valveshaft 330 or the knob shaft 116 having the D-shaped cross section isrotated inside the reinforcement insert ring 240 having the D-shapedcross section.

In addition, inside the shaft coupling pipe 227, 237 is provided with ablocking protrusion 221, 231 for limiting the coupling depth of the knobshaft 116 or the valve shaft 330. The knob shaft 116 and the valve shaft330 contact with the blocking protrusions 221, 231 so that it cannot beinserted beyond the above, thereby adjusting the coupling depth betweenthe knob shaft 116 and the valve shaft 330. The blocking protrusion 221,231 serves to transmit the axial motion of the knob shaft 116 to thefirst shaft coupling portion 220 and transmit the axial motion of thesecond shaft coupling portion 230 to the valve shaft 330.

The joint 200 having the above-described configuration can be assembledin the following manner.

Firstly, the first shaft coupling portion 220 is tilted and insertedinside the joint housing 210 through the insertion hole and then thefirst coupling shaft 225 is fitted into the first slot 216 to make theassembly of the joint housing 210 and the first shaft coupling portion220. At this time, when the rotation direction of the first shaftcoupling portion 220 is left and right direction, the direction oftilting the first shaft coupling portion 220 in order to insert thefirst shaft coupling portion 220 inside the joint housing 210 is up anddown direction.

Then, after inserting the joint spring 260 inside the joint housing 210through the insertion portion, the second shaft coupling portion 230 isinserted by tilting, and then the second coupling shaft 235 is fittedinto the second slot 218, so as to form an assembly between the jointhousing 210 and the second shaft coupling portion 230. At this time,when the rotation direction of the second shaft coupling portion 230 isthe up and down directions, in order to insert the second shaft couplingportion 230 inside the joint housing 210, the direction of tilting thesecond shaft coupling portion 230 is the left and right directions.

In this process, the joint springs 260 can be stably coupled to thefirst shaft coupling portion 220 and the second shaft coupling portion230 in a state that the longitudinal both sides thereof are fitted intothe fitting groove 222 and the longitudinal both sides of the movementare constrained.

As described above, the assembly of the joint 200 according to thepresent implementation is made by fitting the first shaft couplingportion 220 to the joint housing 210 and assembling it, and insertingthe joint spring 260 to the joint housing 210, and subsequently, fittingthe second shaft coupling portion 230 to the housing and assembling it.

For example, the assembly of the joint 200 can be easily and quicklymade only by a sequential fitting operation without using separatefastening structure or an adhesive. In this example, since the joint 200includes only four parts, the manufacturing and the management of thepart is easy and the assembly of the joint 200 can be made more easilyand quickly.

In some implementations, when the assembly of the joint 200 iscompleted, the fitting coupling state of the first shaft couplingportion 220 and the second shaft coupling portion 230 is stablymaintained by the elastic force provided by the joint spring 260, andthus, the assembly of the joint 200 is not optionally released duringuse of the joint 200.

The joint 200 serves to absorb the position error of the valve shaft 330between the knob shaft 116 and the valve shaft 330 and provides thestructure that the rotation of the first shaft coupling portion 220 andthe second shaft coupling portion 230 is possible in order to absorb theposition error of the valve shaft 330. However, it needs a structure forlimiting the rotation range of the first shaft coupling portion 220 andthe second shaft coupling portion 230, that is, the posture change rangeof the first shaft coupling portion 220 and the second shaft couplingportion 230 within the necessary range, according to the property of theproduct which the joint 200 is installed.

The posture change range of the first shaft coupling portion 220 isdetermined by the size of the through hole 214 a. For example, the firstshaft coupling portion 220 can be rotated only within a range in whichinterference between the inner circumferential surface of the firstshaft coupling pipe 227 and the side plate portion 214 is not generated,and the further rotation of the first shaft coupling portion 220 islimited from the point in which the interference between the innercircumferential surface of the first shaft coupling pipe 227 and theside plate portion 214 is generated. Therefore, the posture change rangeof the first shaft coupling portion 220 is determined by the size of thethrough hole 214 a whose the first shaft coupling portion 22 ydetermines the size of the passage for passing through the side plateportion 214.

In other words, the rotation of the first shaft coupling portion 220,that is, the posture change of the first shaft coupling portion 220 islimited to the range between the point which the interference betweenthe inner circumferential surface of the side plate portion 214 and thefirst shaft coupling pipe 227 at the time of one direction rotation ofthe first shaft coupling portion 220 and the point which theinterference between the inner circumferential surface of the side plateportion 214 and the first shaft coupling pipe 227 is made at the time ofthe other side rotation of the first shaft coupling portion 220.

According to the present implementation, the size of the through hole214 a is determined such that the inner diameter of the side plateportion 214 formed with the through hole 214 a is larger than the outerdiameter of the first shaft coupling pipe 227 and is smaller than theinner diameter of the joint housing 210. At this time, the size of thethrough hole 214 a can be suitably adjusted depending on the posturechange range of the first shaft coupling portion 220 to be established.That is, by increasing the size of the through hole 214 a close to theinner diameter of the joint housing 210, the posture change range of thefirst shaft coupling portion 220 can be enlarged, and by reducing thesize of the through hole 214 a close to the outer diameter of the firstshaft coupling pipe 227, the posture change range of the first shaftcoupling portion 220 can be reduced.

The second coupling shaft 235 provided in the second shaft couplingportion 230 may include a stopper 235 a.

The stopper 235 a is formed so as to be protruded outside the secondcoupling shaft 235 and the position inside the second slot 218 inaccordance with the rotation of the second coupling shaft 235 ischanged. The stopper 235 a is arranged inside the second slot 218 suchthat the interference with the inner wall of the joint housing 210formed by the second slot 218 at a set position is made.

According to the present implementation, the second slot 218 is formedwith a width corresponding to the outer diameter of the second couplingshaft 235 (the outer diameter except the stopper). That is, the secondslot 218 is formed so that the width of the second slot 218 and theouter diameter of the second coupling shaft 235 are identical, thecoupling between the second shaft coupling portion 230 and the jointhousing 210 can be made without generating a rattling when the secondshaft coupling portion 230 moves and rotates on the joint housing 210and it can be applied to even the coupling between the first shaftcoupling portion 220 and the joint housing 210.

In addition, the stopper 235 a is formed so as to be protruded towardthe inside of the second slot 218 and is formed to be protruded withnarrower width than the width of the second slot 218. Thus formedstopper 235 a is rotated together with the second coupling shaft 235when the rotation of the second coupling shaft 235 is made, and when therotation of the second coupling shaft 235 is made by the predeterminedangle or more, it is interfered with the inner wall of the joint housing210 formed by the second slot 218, thereby limiting further rotation ofthe second coupling shaft 235.

In other words, the rotation of the second shaft coupling portion 230,that is, the posture change of the second shaft coupling portion 230 islimited to the range between the point which the interference betweenthe inner wall of the joint housing 210 and the stopper 235 a at thetime of one direction rotation of the second shaft coupling portion 230is made and the point which the interference between the inner wall ofthe joint housing 210 and the stopper 235 a is made at the time of theother direction rotation of the second shaft coupling portion 230.

As another example, instead of providing the stopper 235 a on the secondcoupling shaft 235, the structure for the posture change rangelimitation of the second shaft coupling portion 230 may be formed in aform identical to the structure for limiting the posture change range ofthe first shaft coupling portion 220.

That is, a structure for limiting the posture change range of the secondshaft coupling portion 230 may be formed in a form of adjusting theposture change range of the second shaft coupling portion 230 bycovering the side plate portion 214 on longitudinal one side portion ofthe joint housing 210 and adjusting the size of the through hole 214 aformed in the inner side of the side plate portion 214.

However, when the structure for limiting the posture change range of thesecond shaft coupling portion 230 is formed as such form, unlike theside plate portion 214 integrally formed with the joint housing 210 atthe longitudinal other portion of the joint housing 210, the side plateportion at longitudinal one side portion of the joint housing 210 has tobe provided in the form of separate cap shaped part form separable fromthe joint housing 210.

When even the side plate portion of longitudinal one side portion of thejoint housing 210 is integrally formed with the joint housing 210, thepassage to be inserted inside the joint housing 210 in order to assemblythe parts such as the first shaft coupling portion 220, the second shaftcoupling portion 230, and the joint spring 260 are blocked.

However, as such, when the side plate portion of one side portion in thelongitudinal direction of the joint housing 210 is provided in the formof separate cap-shaped part, the number of parts for manufacturing thejoint 200 is added to that extent, and as the number of parts is added,the process for manufacturing it is added. Therefore, the partmanagement is much more difficult and the cost and time required for themanufacturing of the joint 200 is increased to that extent.

In consideration of this point, instead of adding the part in separatecap shape, by taking the structure of adding the stopper 235 a forlimiting the rotation of the second coupling portion 230 as theprotrusion form integrally formed with the second coupling shaft 235,the joint 200 of the present implementation forms the structure ofadjusting the posture change range of the second shaft coupling portionwithout adding separate part.

In some implementations, the joint 200 of the present implementation maybe a structure that can be assembled with four parts including the fewernumber of parts, for example, the joint housing 210, the first shaftcoupling portion 220, the second shaft coupling portion 230, and thejoint spring 260. In this case, the part management and the assemblywork may be facilitated, and cost and time required for themanufacturing of the joint 200 may be reduced.

FIG. 42 is a perspective view showing a valve assembly of the knobassembly in accordance with an exemplary implementation of the presentdisclosure, and FIG. 43 is a perspective view showing a state in whichthe valve assembly of the knob assembly in accordance with an exemplaryimplementation of the present disclosure is separated.

As shown, the valve assembly 300 includes a valve 310 coupled to the gaspipe frame 35 and the gas pipe 30, an ignition switch 360 fitted to thevalve shaft 330 of the valve 310, and the knob sensor 400.

The knob sensor 400 includes a knob sensor plate 410 fastened to thevalve 310, a knob sensor housing 430 movably coupled to the knob sensorplate 410 in an axial direction, a sensor spring 420 providing theelastic force between the knob sensor housing 430 and the knob sensorplate 410, a knob sensor board 440 having the Hall sensor 444 andfastened to the knob sensor housing 430, and a rotating plate 450coupled with a knob sensor magnet 460 which is coupled to the valveshaft, rotates integrally with the valve shaft, and sensed by the Hallsensor 444.

The ignition switch 360 has a valve shaft coupling hole 362 having aD-shaped cross section, and is coupled to the valve shaft. Therefore,the ignition switch 360 receives the rotational force of the valveshaft, so that the on/off state of the valve shaft can be switched bythe rotational angle. When the valve shaft is rotated by a predeterminedangle, the ignition switch 360 becomes on state, it servers to making aspark be generated in the burner.

FIG. 44 is a perspective view of showing a valve, FIG. 45 is an explodedperspective view of a valve, FIG. 46 is a longitudinal sectional view ofa valve of a knob assembly according to the present disclosure, and FIG.47 is a transverse cross-sectional view of a valve.

As shown, the valve 310 includes a valve body 312, a valve cap 314, amain adjustment piece 320, a valve shaft 330, a valve spring 340, and anauxiliary adjustment piece 350.

The main adjustment piece 320 and the auxiliary adjustment piece 350 arearranged inside the valve body 312.

The valve body 312 includes an inflow pipe 312 a connected to the gaspipe, and a first gas supply pipe connecting portion 312 b connected tothe burner, and a second supply pipe connecting portion 312 c.

In addition, inside the valve body 312, the first flow path 312 dconnecting the outer circumferential surface space of the mainadjustment piece 320 and the auxiliary adjustment piece 350, and thesecond flow path 312 e connecting the auxiliary adjustment piece 350 andthe second supply pipe connecting portion 312 c.

The main adjustment piece 320 and the auxiliary adjustment piece 350have the rotation center parallel to the longitudinal direction of thevalve shaft and arranged inside the valve body 312.

The main adjustment piece 320 includes a connection hole 325 formed fromthe rear surface to the front surface, an opening and closing hole 324penetrating through the inner and outer circumferential surface of theconnection hole 325, and a groove 326 formed along the outercircumferential surface in one side of the opening and closing hole 324.

The auxiliary adjustment piece 350 may include a T-shaped adjustmenthole 354 capable of adjusting the amount which gas supplied through thefirst flow path 312 d to the second flow path 312 e.

The main adjustment piece 320 has a structure for adjusting the gassupply flow rate according to the degree of which the opening andclosing hole 324 and the inflow pipe 312 a are overlapped. Gasintroduced through the opening and closing hole 324 is supplied to thefirst gas supply pipe connection portion 312 b through the connectionhole 325.

At this time, gas supplied through the groove 326 formed on the outercircumferential surface of the main adjustment piece 320 is alsosupplied through the first flow path 312 d. In gas supplied through thefirst flow path 312 d, the flow rate supplied to the second supply pipeconnecting portion 312 c is adjusted according to the overlapped degreeof an adjustment hole 354 of the auxiliary adjustment piece 350 and thefirst flow path 312 d.

The main adjustment piece 320 is adjusted by the valve shaft 330 and theauxiliary adjustment piece 350 is adjusted by separate tool such as adriver.

The auxiliary adjustment piece 350 is for fine adjustment of the amountof gas to be supplied, and may not be adjusted after one adjustmentaccording to the installation environment, and may be adjusted by aservice engineers rather than being adjusted by the user.

If an access to the auxiliary adjustment piece 350 is not easy, anexcessive disassembly operation of the cooking appliance may be neededfor the repair engineers to adjust the auxiliary adjustment piece 350.

In the present disclosure, the auxiliary adjustment piece 350 isarranged adjacent to one side of the main adjustment piece 320, andafter separating the knob, the service hole 129 in FIG. 57 may providean access to the auxiliary adjustment piece 350.

The main adjustment piece 320 has a key groove 322 into which a key 332provided on the valve shaft 330 is inserted and a valve spring 340 isarranged between the main adjustment piece 320 and the valve shaft 330.The valve spring 340 provides the elastic force to a direction which thevalve shaft 330 is spaced apart from the main adjustment piece 320, andprovides a structure that the rotation of the valve shaft 330 istransmitted to the main adjustment piece 320 by pressing the valve shaft330 in a axial direction and inserting the key 332 of the valve shaft330 to a key groove 322 of the main adjustment piece 320.

The assembly process of the valve 310 is made method by coupling themain adjustment piece 320 and the auxiliary adjustment piece 350 to thevalve body 312, and fastening the valve cap 314 in the valve body 312 ina state that the valve spring 340 and the valve shaft 330 are fittedinto the main adjustment piece 320. The fastening of the valve cap 314and the valve body 312 may be made by the method of penetrating thefastening hole 314 f formed in the valve cap 314 and fastening to thefastening hole 314 f formed in the valve body 312 by using the fasteningvolt S6.

The valve cap 314 according to the present disclosure includes a sensorfixed portion 314 d for fixing the knob sensor 400 described below, anda service hole 314 b of providing a path in which the tool is accessiblewith the auxiliary adjustment piece 350. The service hole 314 b isprovided with the knob assembly provided in the front of the valve 310and the front panel is provided with the service hole aligned with theservice hole 314 b. The sensor fixed portion 314 d is fastened with theknob sensor plate 410 of the knob sensor 400.

FIG. 48 is an exploded perspective view showing a knob sensor of theknob assembly in accordance with an exemplary implementation of thepresent disclosure, FIG. 49 is a perspective view showing a state whichthe knob sensor board of the knob assembly in accordance with anexemplary implementation of the present disclosure is assembled to theknob sensor housing, and FIGS. 50 and 51 are the cross sectional viewsfor explaining the operation of the valve assembly of the knob assemblyof the present disclosure.

As shown, the knob sensor 400 includes a sensor plate 410, a sensorspring 420, a knob sensor housing 430, a knob sensor board 440, and arotating plate 450.

The sensor plate 410 provides a fastening hole 432 to be fastened to thevalve cap 314 described above. The sensor plate 410 is fixed to thevalve cap 314 and serves to fix the position of the sensor housing 430and to support the sensor spring 420 that provides the elastic force tothe sensor housing 430.

The fastening hole 432 of the sensor plate 410 is fastened to thefastening hole 314 d of the valve cap (314 in FIG. 44 ) using afastening bolt S7.

The sensor plate 410 provides a valve shaft hole 412 at a centralportion. Since the sensor plate 410 should not be affected by thepressing or rotation of the valve shaft 330, the valve shaft throughhole 412 has an inner diameter larger than the outer diameter of thevalve shaft 330.

A spring fixed portion 415 in which the sensor spring 420 is seated tothe outside of the valve shaft through hole 412 is provided. The rearend side of the sensor spring 420 is inserted into the spring fixedportion 415 and the portion is fixed. The sensor spring 420 provides anelastic force in a direction in which the knob sensor housing 430positioned in front of the sensor plate 410 is spaced apart from thesensor plate 410. It is such that the knob sensor board 440 mounted onthe knob sensor housing 430 and the rotating plate 450 arranged in frontof the knob sensor board 440 to maintain the predetermined spacing.

Since the sensor plate 410 has a structure in which the elastic force ofthe sensor spring 420 is repeatedly applied, three or more points arefastened to the valve cap 314 for stable fastening, for instance. Insome examples, the sensor plate 410 may maintain a fixed state correctlyin a predetermined posture.

In some implementations, the sensor plate 410 provides a plurality ofguide protrusions 411 protruded forward. The guide protrusion 411 isinserted into a guide portion 431 provided in the knob sensor housing430 so that the knob sensor housing 430 can maintain a predeterminedposture.

In some examples, three or more guide protrusions 411 are arranged atthe circumference of the valve shaft through hole 412. The knob sensorhousing 430 can move forward and rearward to the longitudinal directionof the valve shaft 330 while maintaining the state parallel to thesensor plate 410 by the guide protrusion 411.

The knob sensor housing 430 serves to fix the knob sensor board 440 andto maintain the rotating plate 450 and the knob sensor board 440 at apredetermined spacing.

The knob sensor 400 is operated in a principle of sensing the rotationalangle of the valve shaft 330 by sensing the position of the knob sensormagnet 460 provided in the rotating plate 450 via the plurality of Hallsensors 444 arranged radially to the knob sensor board 440.

Referring to FIG. 49 , seven Hall sensors 444 are arranged on the knobsensor board 440 so as to have a radially equal spacing. The rightmostHall sensor below the rightmost is referred to as the first, and othersare referred to as the second to the seventh Hall sensor.

The knob sensor 400 constitutes an absolute coordinate in such a mannerthat a signal of a different kind is generated for each Hall sensor 444and the position of the knob sensor magnet 460 is sensed by using theabsolute coordinate configured as such.

For example, regardless of the position immediately before the knobsensor magnet 460, if a finally received signal is a signal generated bythe n^(th) Hall sensor, the position of the knob sensor magnet 460 issensed as a position corresponding to the n^(th) Hall sensor area.

Therefore, even when the operation of the knob is rapidly made, finally,the final position of the knob sensor magnet 460 can be precisely sensedin a state when the rotation of the knob handle is completed, therebyaccurately grasping the fire power thus set.

When the knob sensor 400 has a method of using a relative coordinatewhich is a method that senses a position change from a positionimmediately before the knob sensor magnet 460, when the knob is rotatedat a very high speed, a problem may be generated that the positionsensing of the knob sensor magnet 460 may not be made properly.

For example, in order for the position of the knob sensor magnet 460moved from the position corresponding to the first Hall sensor area tothe position corresponding to the seventh Hall sensor area to beaccurately recognized, on state change in the second to the seventh Hallsensors has to be made sequentially. When the movement of the knobsensor magnet 460 is made at a rapid speed, on status change in someHall sensor cannot be made, and in this case, the error can be generatedin the positioning of the knob sensor magnet 460. In this case, theerror of recognizing the position of the knob sensor magnet 460 as theposition corresponding to the area between the second Hall sensor andthe sixth Hall sensor, or recognizing that the rotation of the knob isnot made.

In some examples, the rotating plate 450 may be fixed to rotate togetherwith the valve shaft 330. In other examples, the knob sensor board 440may maintain a predetermined posture regardless of the rotation of thevalve shaft 330.

In some examples, the valve shaft 330 not only rotates but also movesforward and backward even in the axial direction. The rotating plate 450fixed to the valve shaft 330 moves along with the movement of the valveshaft 330. Hereinafter, the direction in which the valve shaft 330 ismoved to the inner side of the cooking appliance by pushing the knob isreferred to as backward, and the opposite direction is referred to asforward.

When the rotating plate 450 is moved backward, the knob sensor housing430 positioned at the rear of the rotating plate 450 is pushed by therotating plate 450 and moved to the inside the cooking appliance.

When the valve shaft 330 moves forward due to the restoring force of thevalve spring, the rotating plate 450 also moves forward. At this time,since the knob sensor housing 430 is not affected by the movement of thevalve shaft 330, it moves forward with the rotating plate 450 by therestoring force of the sensor spring 420 provided between the knobsensor housing 430 and the knob sensor plate 410.

Therefore, the knob sensor housing 430 is also moved forward andbackward in response to the forward and backward movement of therotating plate 450, so that the spacing between the rotating plate 450and the knob sensor housing 430 is maintained constant. As a result, thespacing between the knob sensor magnet 460 provided on the rotatingplate 450 and the Hall sensor 444 provided on the knob sensor board 440fastened to the knob sensor housing 430 can be maintained constant.

In some examples, the spacing between the knob sensor board 440 and therotating plate 450 may be set by a plurality of support protrusion 435provided on the knob sensor housing 430. In some examples, three supportprotrusions 435 may be arranged with a spacing of 120°. Since threepoints can define a plane, when forming three support protrusions, thesupport protrusion 435 may contact the rotating plate 450 to maintain aconstant spacing between the rotating plate 450 and the knob sensorhousing 430.

The center of the knob sensor board 440 is provided with a valve shaftthrough hole 442 through which the valve shaft 330 is penetrated, andthe periphery thereof is provided with the support protrusion throughhole 445 through which the support protrusion 435 provided on the knobsensor housing 430 is penetrated.

The knob sensor board 440 may be coupled to the knob sensor housing 430through a fastening bolt S8 and a fastening protrusion 434. In the caseof the illustrated implementation, the knob sensor board 440 is providedwith four fastening holes 443 and the knob sensor housing 430 isprovided with two fastening holes 433 and two fastening protrusions 434,and it is the structure which two points are fastened to the fasteningbolt S8 and other two points are fixed to the fastening protrusion 434,but the number of the fastening of the fastening bolt S8 can beincreased and decreased.

Referring to FIGS. 50 and 51 , when the knob is pushed, the joint 200 ismoved to the right in the figure, the sensor spring 420 and the valvespring 340 are compressed by the movement of the joint 200, and thevalve shaft 330 and the knob sensor housing 430 in which the rotatingplate 50 and the knob sensor board 440 are fastened together, and aremoved together to the right.

When the pushing force is removed, by the restoring force of the valvespring 340 and the sensor spring 420, the valve shaft 330, the knobsensor housing 430 to which the knob sensor board 440 is fastened, andthe rotating plate 450 are restored to the original position.

The knob sensor plate 410 is fastened to the valve cap 314 and thesensor spring 420 provides elastic force in a direction to closelyattach the knob sensor housing 430 to the rotating plate 450. Therefore,the rotating plate 450 contacts with the first shaft coupling pipe 227of the joint 200, and in the knob sensor housing 430, the supportprotrusion 435 contacts with the rotating plate 450.

A state which the supporting protrusion 435 of the knob sensor housing430 contacts with the rotating plate 450 is always maintained in a statebefore the knob is pushed such as FIG. 50 , or in a state when the knobis pushed as show in FIG. 51 .

Therefore, in spite of the axial movement of the valve shaft, the knobsensor plate 410 and the rotating plate 450 of the knob sensor canalways maintain the predetermined spacing, and thus, the spacing betweenthe knob sensor magnet 460 arranged to the rotating plate 450 and theHall sensor 444 arranged at the knob sensor plate 410 can be maintainedconstantly. Such structure improves the operation reliability of theknob sensor 400.

FIG. 52 is a longitudinal sectional view for explaining the operationand supporting structure of the knob of the knob assembly in accordancewith an exemplary implementation of the present disclosure.

First, the support structure of the knob 110 will be reviewed. The knob110 has the structure which penetrates through the inner support pipe124 f and the outer supporting pipe 124 c of the knob ring 120, andpenetrates through the fixed pipe 190, and fitting coupled to the firstshaft coupling portion of the joint 200.

The knob shaft 116 is supported at the first support point P1 on theinner surface of the inner supporting pipe and may be supported at thesecond supporting point P2 inside the fixed pipe 190. The rotationalforce of the knob shaft 116 is transmitted to the second shaft couplingportion 230 of the joint 200 to which the end is fastened, and the knobring 120 and the fixed pipe 190 merely perform the function ofsupporting the knob shaft 116, and the rotational force of the knobshaft 116 is not received.

In some examples, in order to improve the assembly convenience of theknob shaft 116, the knob shaft 116 includes a large diameter portion 116a starting from a portion to which the knob ring body is coupled, asmall diameter portion 116 c starting from an end coupled to the joint,and a tapered portion 116 b whose outer diameter is reducedtherebetween.

A portion of the large diameter portion 116 a and the first tube part192 are received in the outer supporting pipe 124 c of the knob ring120.

The outer supporting pipe 124 c of the knob ring back plate 124 isformed to have an inner diameter corresponding to the large diameterportion 116 a and the inner supporting pipe 124 f of the knob ring backplate 124 is formed with the first portion 124 f_1 having the innerdiameter corresponding to the large diameter portion 116 a and thesecond portion 124 f_2 having the inner diameter corresponding to thesmall diameter section. Such structure results in an effect of capableof smoothly inserting the knob shaft 116 to the outer supporting pipe124 f.

In addition, a first supporting point P1 is formed on the innercircumferential surface of the second portion 124 f_2.

In some implementations, it provides the structure that the smalldiameter portion 116 c of the knob shaft 116 protruded to the innersupporting pipe 124 f is again supported at the second supporting pointP2 inside the fixed pipe 190 and two points are supported as a whole.The fixed pipe 190 includes a fixed circular plate portion 191 fastenedto the fixed frame, the first tube part 192 extending from the fixingcircular plate portion and having a shape which the inner diameter isreduced, and the second tube part surrounding the second shaft couplingpipe 237 of the joint 200. In some examples, the second tube part 193has an incision portion 193 a formed in the longitudinal direction ofthe shaft so that the second shaft coupling pipe 237 can be easilycoupled to the second tube part 193.

The knob shaft 116 has the structure fitting coupled to the second shaftcoupling pipe 237 of the joint 200 inside the second tube part 193 ofthe fixed pipe 190, after penetrating through the outer supporting pipe124 c and the inner supporting pipe 124 f of the knob ring back plate124, and at this time, the supporting of the knob shaft 116 are made ata first supporting point P1 arranged inside the inner supporting pipe124 f and the second point P2 arranged inside the fixed pipe 190.

FIG. 53 is a rear view showing a knob ring of the knob assembly inaccordance with an exemplary implementation of the present disclosure,FIG. 54 is a transverse cross-sectional view showing the coupling stateof the knob ring of the knob assembly in accordance with an exemplaryimplementation of the present disclosure, and FIGS. 55 and 56 are theviews for explaining the operation of the knob ring of the knob assemblyin accordance with an exemplary implementation of the presentdisclosure.

The knob 110 and the knob ring 120 are coupled to the front surface ofthe front panel 10 and the support frame 150 and the actuating member170 and the fixed frame 180 are coupled to the rear surface of the frontpanel 10.

The support frame 150 is fastened to the rear surface of the front panel10 and the actuating member 170 penetrates through the front panel 10and is fastened to the knob ring 120. At this time, the rotation centerof the actuating member 170 is arranged to coincide with the rotationcenter of the knob 110. The actuating member 170 serves to constrain therotation center of the knob 110 to be at a center position with regardto the front panel 10. For example, when the actuating member 170 isfixed in the center position about the front panel 10, the knob 110 canbe fixed in the correct position with regard to the front panel 10.

The actuating member 170 is inserted inside the support frame 150 andsome are protruded to the front surface of the front panel 10 throughthe front panel 10. The front of the actuating member 170 is protrudedto the front surface of the front panel which the operating portion 171having the cylindrical shape is formed and the operating portion 171 isformed longer than the thickness of the support frame 150.

The inner circular plate area 124 j of the knob ring back plate 124 iscoupled with the operating portion 171 of the actuating member 170protruded to the front surface of the front panel 10. The knob ring 120is coupled to the actuating member 170 supported by the support frame150, and, consequently, the supporting structure in which the knob ring120 is supported by the support frame 150 is formed.

The operation of the knob ring 120 can be recognized by the rotation ofthe actuating member 170 rotated connected with the rotation of the knobring 120. Since the knob ring 120 is the part exposed to the outside thefront panel 10, a knob ring sensor 500 for sensing the operation of theknob ring 120 being installed around the knob ring 120 from the outsideof the front panel 10 is externally not good.

In view of the above, in the present implementation, the knob ringsensor 500 is installed around the actuating member 170 inside the frontpanel 10, and the knob ring sensor 500 installed as such can sense therotation of the knob ring 120 in a manner of sensing the rotation of theactuating member 170 inside the front panel 10.

In some examples, the knob assembly structure of the presentimplementation is provided with a fixed frame 180 for preventing theactuating member 170 from being deviate to the rear surface so that theactuating member 170 can stably operate.

The fixed frame 180 is provided as the form across the rear surface ofthe actuating member 170 and is fixed to the support frame 150. Thefixed frame 180 makes the actuating member 170 not be deviated to therear surface while limiting the rotation range of the actuating member170 within the designated range. And the extended portion 173 of theactuating member 170 can be moved only within the pivotable region 182of the fixed frame 180.

According to the present implementation, the actuating member 170 has anextended portion 173 formed to be extended outwardly the circular plateportion 172 formed on the rear surface, and the extended portion 173 isformed inside the fixed frame 180.

As such, the extended portion 173 arranged inside the fixed frame 180can move within a movable region within the fixed frame 180, and, fromthe point interfered with the upper side inner wall and the lower sideinner wall of the fixed frame 180, the movement thereof is limited.

As such, when the movement range of the extended portion 173 is limitedby the fixed frame 180, the rotation angle in both directions of theactuating member 170 can be limited within the predetermined range.

By applying the structure in which the extended portion 173 is providedon both sides of the actuating member 170 and the movement rangelimitation of each extended portion 173 is made at the same position,the rotational range limit of the actuating member 170 can be made morestably.

In addition, the actuating member 170 is coupled to a pair of restoringsprings 156 a, 156 b that provide an elastic force to return theactuating member 170 to the initial position, which is rotated from itsinitial position to spaced position.

The actuating member 170 and the knob ring 120 are integrally rotated sothat the knob ring 120 maintains the initial position due to the elasticforce of the restoring spring 156 connected to the actuating member 170.Further, the knob ring 120 maintaining the initial position as the abovecan rotate clockwise or counterclockwise at a predetermined angle. Whenthe external force is released in the rotated state, it can be returnedto the initial position by the restoring force which the restoringspring 156 a, 156 b provides.

For example, when the actuating member 170 is rotated in thecounterclockwise by the operation of the knob ring 120, as shown in FIG.54 , the first restoring spring 156 a of the pair of restoring springsprovides the elastic force working clockwise so that the actuatingmember 170 can be returned to its initial position. Further, the secondrestoring spring 156 b, which is the other one of the pair of restoringsprings 156 provides the elastic force working counterclockwise suchthat the actuating member 170 is returned to the initial position, whenthe actuating member 170 is rotated clockwise by the operation of theknob ring 120, as shown in FIG. 10 .

In some examples, referring to FIG. 54 , the restoring magnet 158, 178is provided at the corresponding portion to each other of the supportframe 150 and the circular plate portion 172 of the actuating member170, respectively. The restoring magnet 158 is arranged such that therestoring magnet 178 provided in the actuating member 170 and therestoring magnet 158 provided in the support frame 150 are aligned whenthe actuating member 170 is in the origin. The restoring magnet 158, 178is arranged such that a different polarity from each other is arrangedin order to work an attraction mutually.

The restoring magnet 158 provided in the support frame 150 is fittedcoupled from the left side to the right side in the drawing and isfitted and coupled from the right side to the left side in the drawingof the restoring magnet 178 provided on the actuating member 170. Thisis for the attraction working between the restoring magnets 158, 178 towork in the direction in which the restoring magnet 158, 178 is insertedinto the groove. Such structure results in an effect of preventing therestoring magnet 158, 178, which is tilted by fitting the restoringmagnet 158, 178, from deviating without using separate adhesive.

The knob ring sensor magnet 530 is provided to change the position bybeing connected with the rotation of the actuating member 170 and theknob ring sensor 500 senses a position change of the knob ring sensormagnet 530, thereby sensing the rotation of the knob ring 120, and,senses the rotation of the knob ring 120 connected to the actuatingmember 170.

The knob ring sensor magnet 530 is the configuration which is thesensing subject of the knob ring sensor 500 and installed on theactuating member 170. In the present implementation, it is exemplifiedas for the knob ring sensor magnet 530 to be installed at the circularplate portion 172 of the actuating member 170. In FIGS. 55, 56 , theknob ring sensor magnet 530 is covered at the rear side of the knob ringsensor board 520, and the knob ring sensor magnet 530 is shown in adotted line in the above Figures.

The knob ring sensor magnet 530 is installed on the circular plateportion 172 and installed so as to be arranged on one side of thecircular plate portion 172 facing the knob ring sensor 500. The positionof the knob ring sensor magnet 530 installed as such can be changed in aform that it is rotated together with the actuating member 170 whenrotating the actuating member 170.

In the present implementation, it is exemplified that the knob ringsensor magnet 530 is arranged at a position adjacent to the outercircumferential surface of the circular plate portion 172. The positionof the knob ring sensor magnet 530 arranged at such a position can bechanged by drawing a trajectory similar to the shape of the outercircumferential surface of the circular plate portion 172 which iscircular shape when rotating the actuating member 170.

The knob ring sensor 500 is provided to sense a position change of theknob ring sensor magnet 530 and is fastened to the support frame 150 atthe rear surface of the actuating member 170.

As an example, the knob ring sensor 500 may include a knob ring sensorhousing 510, a knob ring sensor board 520, and Hall sensor 522 a, 522 b.

The knob ring sensor housing 510 is installed to be fixed to the supportframe 150 or, for example, to the lower side of the frame main bodyportion 141. The knob ring sensor housing 510 is installed with the knobring sensor board 520 connected to the controller of the cookingappliance.

In the present implementation, the knob ring sensor board 520 isinstalled on the knob ring sensor housing 510 and is illustrated asbeing installed on the side facing the frame main body portion 141 andthe knob ring sensor magnet 530. Further, a sensor for sensing theposition change of the knob ring sensor magnet 530 is installed on theknob ring sensor board 520.

The knob ring sensor 500 having the above-described configuration sensesthe position of the knob ring sensor magnet 530 in a non-contact manner,like the knob sensor 400. For this, the knob ring sensor magnet 530includes a magnetic member of generating a magnetic force, and the knobring sensor 500 includes a Hall sensor 522 of sensing the magnetic forceof the magnetic member adjacent with a predetermined distance. The Hallsensor 522 is installed on the knob ring sensor board 520. When the knobring sensor magnet 530 approaches the Hall sensor 522 within apredetermined distance, it senses the magnetic force of the knob ringsensor magnet 530, and generates a signal corresponding thereto.

The knob ring sensor 500 includes a plurality of Hall sensors 522 andthe plurality of Hall sensors 522 are arranged to be spaced apart at apredetermined spacing along the rotation path of the knob ring sensormagnet 530.

That is, when rotating the actuating member 170, when the knob ringsensor magnet 530 is rotated in the circular trajectory similar to theshape of the outer circumferential surface of the circular plate portion172, the knob ring sensor 500 is arranged in a form which the pluralityof Hall sensors 522 are positioned on the arc corresponding to therotation trajectory of the knob ring sensor magnet 530.

In the present implementation, it is exemplified that a pair of Hallsensors 522 a and 522 b are arranged on the knob ring sensor 500, andthe arrangement of the Hall sensor 522 a, 522 b and the knob ring sensormagnet 530 is made in a form positioning between the pair of the Hallsensors 522 when the knob ring 120 and the actuating member 170 are inthe initial position.

According to it, at the time of one direction rotation of the knob ring120, the knob ring sensor magnet 530 approaches to any one (hereinafterreferred to as “left side Hall sensor”) of the pair of Hall sensors 522,and the sensing about the knob ring sensor magnet 530 in thecorresponding Hall sensor 522 a is made, and at the time of the otherdirection of the knob ring 120, the knob ring sensor magnet 530approaches to the other one (hereinafter referred to as “the right sideHall sensor”) of the pair of Hall sensors 522, and the sensing about theknob ring sensor magnet 530 in the corresponding Hall sensor 522 b ismade.

When the knob ring 120 is provided to provide a timer function, and theknob ring 120 is rotated in one direction, the knob ring sensor magnet530 approaches within the predetermined distance to the left Hall sensor522 a, the sensing with regard to the knob ring sensor magnet 530 in theleft Hall sensor 522 a is made, and accordingly, the operation of theknob ring 120 for the time operation initiation is sensed by the knobring sensor 500 such that the operation of the timer can be proceeded.

In addition, the knob ring is rotated to the other direction, the knobring sensor magnet 530 approaches within the predetermined distance tothe right Hall sensor 522 b and the sensing with regard to the knob ringsensor magnet 530 in the right Hall sensor 522 b is made, andaccordingly, the operation of the knob ring 120 for the time operationinitiation is sensed such that the operation of the timer can beproceeded.

In the present implementation, it is exemplified as generating adifferent kind of signal for each Hall sensor 522. That is, the signalgenerated by the left Hall sensor 522 a is different from the signalgenerated by the right Hall sensor 522 b.

By using this, the function of the knob ring 120 may be configured suchthat the set time of the timer is set differently according to therotation direction of the knob ring 120 and the function of the knobring 120 may be configured such that each different function is providedaccording to the rotation direction of the knob ring 120.

As an example, the function of the knob ring 120 may be configured suchthat the set time of the timer is set in a 10 minutes unit at the timeof one direction rotation, and the set time of the timer is set in 1minute unit at the time of the other direction rotation.

In addition, when maintaining the state rotated in one direction for apredetermined time or more, the set time can be continuously increased.For example, when the knob ring 120 is rotated to the right, the timerset time is increased by 10 minutes unit, and the knob ring 120 isrotated to the left and then immediately returned (hereinafter, referredto as a click), in the case of increasing by the timer set time by 1minute unit, when the state rotated to the right is maintained for apredetermined time (for example, 3 seconds) or more (hereinafterreferred to as long pushing), the timer set time is continuouslyincreased in 10 minutes unit.

In other words, the timer set time of one unit can be increased by ashort click, and the continuous increase of the timer set time can bemade through a long push.

Since this click and long push all can be applied to the left and rightdirection of both sides, four signals can be set using two Hall sensors.

In some cases, two of four signals may be used as a signal for the timertime setting, and the remaining two signals may be used as a signal forsetting other function such as selecting a cooking mode.

As another example, the function of the knob ring 120 may be configuredsuch that a timer is set at the time of one way rotation of the knobring 120 and the release of the timer set is released at the time of theother direction rotation of the knob ring 120.

As still another example, the function of the knob ring 120 may beconfigured such that the timer function is provided at the time of onedirection rotation of the knob ring 120 and other function is providedother than the timer function at the time of the other direction timerfunction.

In some examples, the signal generated through the Hall sensor 522 maybe provided as basic information for grasping information output throughthe display device 125.

For example, by using a signal generated from the left Hall sensor asbasic information, information such as whether to initiate the timeroperation, the timer time, etc., can be grasped, and information thusgrasped can be displayed in a form of letters, graphics, or colorsthrough the display device 125.

FIG. 57 is a perspective view showing a state in which the knob of theknob assembly in accordance with an exemplary implementation of thepresent disclosure is separated, and FIG. 58 is a transversecross-sectional view in a state which the knob of the knob assembly inaccordance with an exemplary implementation of the present disclosurewith the knob is separated.

The knob assembly according to the present disclosure can be separatedby pulling the knob. When the knob is separated, the knob ring backplate 124, which was covered by the knob, is exposed to the outside.

Referring to FIG. 57 , it can be seen that the locking bracket 140passes through the bracket hole 124 b of the knob ring back plate 124and is fastened to the front panel 10. At this time, a knob passagegroove 144 is formed in the rear of the locking piece 142 of the lockingbracket 140.

In a state which the knob is not pushed, the engaging surface (114 d inFIG. 9 ) of the knob back plate is adjacent to the right side of thelocking piece 142 of the locking bracket 140. When the knob is pushed,the engagement surface (144 d in FIG. 9 ) is adjacent to the right sideof the knob passage groove 144 of the locking bracket 140. Therefore,the knob can be rotated only when the knob is pushed.

A service hole 129 is provided on the left of the knob ring back plate124. The service hole 129 is formed in a position aligned with theauxiliary adjustment piece 350 of the valve 310 in a straight line.

A tool such as the driver can be entered through the service hole 129 toadjust the auxiliary adjustment piece 350 of the valve 310.

The service hole 129 is formed to penetrate through the knob ring backplate 124, the front panel 10, the support frame 150, and the actuatingmember 170, as shown in FIG. 58 .

Such structure results in an effect of improving the convenience ofmaintenance by separating only the knob without separating the frontpanel 10 and adjusting the auxiliary adjustment piece 350 of the valve310.

In some examples, the spacing between the valve shaft 330 and theservice hole 129 has to be set in consideration of the size of the joint200 and the knob sensor 400. When the radius of the joint 200 is largerthan the spacing between the valve shaft 330 and the service hole 129,the joint interferes on the path of the service hole 129.

Likewise, when the radius of the knob sensor 400 is larger than thespacing between the valve shaft 330 and the service hole 129, the knobsensor 400 interferes on the path of the service hole 129. Of course,the service hole 129 may also be penetrated also in the knob sensor 400.

An adjustment of the auxiliary adjustment piece 350 using the servicehole 129 may not be generally made, but may be sometimes necessary inthe case of manual adjustment by a user. In some cases, the front panel10 may be disassembled to operate the auxiliary adjustment piece 350,which may be difficult to be performed by the user and may need to beperformed by a service engineer. In some examples, when the knob may beseparated, as described in the present disclosure, to operate theauxiliary adjustment piece 350, a user may perform an adjustment of theauxiliary adjustment piece 350.

While the present disclosure has been described with reference to theimplementations shown in the drawings, it will be understood that it ismerely illustrative and many variations and equivalent otherimplementation are possible from the above for those skilled in the art.Therefore, the true technical protection range of the present disclosureshould be defined by claims below.

What is claimed is:
 1. A knob assembly for an appliance comprising aknob ring configured to be disposed at a front side of a front panel ofthe appliance, to circumferentially surround a knob of the appliance andto rotate independently of a rotation of the knob, wherein the knob ringincludes a knob supporting portion that is configured to surround ashaft of the knob, wherein the knob supporting portion includes a sleeveportion that is configured to be axially fixed with respect to the frontpanel and that axially extends away from the knob ring, wherein theshaft and the knob are installed to the sleeve portion and configured tobe slidable and rotatable relative to the sleeve portion, and whereinthe sleeve portion is configured to guide a rotation and an axialmovement of the shaft.
 2. The knob assembly of claim 1, wherein the knobring includes a plate extending radially from the sleeve portion, andwherein the sleeve portion extends axially in a front direction from theplate and in a rear direction from the plate.
 3. The knob assemblyaccording to claim 1, wherein the sleeve portion is configured to extendto an inner space of the knob through an opened rear of the knob.
 4. Theknob assembly of claim 1, wherein the sleeve portion is configured topass through the front panel and into an interior of the appliance. 5.The knob assembly of claim 1, further comprising a support frameconfigured to be fastened to the front panel, wherein the sleeve portionis configured to pass through the support frame.
 6. The knob assemblyaccording to claim 5, wherein the knob ring is configured to be disposedbetween the knob and the support frame.
 7. The knob assembly accordingto claim 5, wherein a rear surface of the knob ring being configured tobe disposed on the front side of the front panel to thereby interpose aportion of the front panel between the knob ring and the support frame.8. The knob assembly of claim 5, further comprising an actuating memberthat is rotatably supported by the support frame and configured torotate together with the knob ring relative to the support frame,wherein the support frame is configured to be fastened to a rear side ofthe front panel and the actuating member is configured to be attached tothe knob ring through the front panel.
 9. The knob assembly of claim 8,wherein the sleeve portion is configured to pass through the actuatingmember.
 10. The knob assembly according to claim 8, wherein the sleeveportion extends to an inner space of the actuating member.
 11. The knobassembly according to claim 8, wherein the support frame defines asupport frame through-hole, an inner surface of the support framethrough-hole being configured to guide a rotational motion of the knobring and the actuating member.
 12. The knob assembly according to claim11, wherein the actuating member comprises: a cylindrical surface whichis supported by the inner surface of the support frame through-hole; anda radially extended portion which extends radially outward from thecylindrical surface at a rear of the support frame.
 13. The knobassembly according to claim 8, further comprising a fixed frame which isattached to the support frame and supports the actuating member in anaxial direction.
 14. The knob assembly according to claim 13, furthercomprising a fixed pipe which is attached to the fixed frame and isconfigured to surround the shaft and to guide a rotation of the shaft.15. The knob assembly according to claim 1, wherein the knob ringincludes: a knob ring back plate extending radially from the sleeveportion; and a knob ring body configured to surround the knob to allowan axial movement of the knob.
 16. The knob assembly according to claim15, wherein the knob ring body is attached to a front of the knob ringback plate, and wherein a space defined by a radial inner space of theknob ring body and a front space of the knob ring back plate isconfigured to accommodate the knob and allow the knob to move axiallyrelative to the knob ring.
 17. An appliance comprising a knob assemblyand a front panel defining appearance of the appliance, the knobassembly comprising: a knob ring that is disposed at a front side of thefront panel and is configured to be rotated by a user; a knob that isdisposed at the front side of the front panel and configured to berotated by the user independently of a rotation of the knob ring; ashaft extending rearward from the knob; and a sleeve portion extendingaway from the knob ring and surrounding the shaft to guide a rotationand an axial movement of the shaft, the sleeve portion being configuredto be axially fixed with respect to the front panel, wherein the shaftand the knob are installed to the sleeve portion and configured to beslidable and rotatable relative to the sleeve portion.
 18. The applianceaccording to claim 17, wherein the knob ring includes: a knob ring backplate extending radially from the sleeve portion; and a knob ring bodyconnected to a front of the knob ring back plate, wherein a spacedefined by a radial inner space of the knob ring body and a front spaceof the knob ring back plate is configured to accommodate the knob andallow the knob to move axially relative to the knob ring.